chore: pin jest to major version 27 (#20289)

`jest` (and `ts-jest`) `^28` now have a requirement for typescript
`4.3`. https://github.com/facebook/jest/releases/tag/v28.0.0


----

### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: corymhall

.github/workflows/yarn-upgrade.yml

@@ -67,7 +67,7 @@ jobs:
           lerna exec --parallel ncu -- --upgrade --reject='@types/node,@types/fs-extra,constructs,typescript,aws-sdk,aws-sdk-mock,${{ steps.list-packages.outputs.list }}'  --target=minor
           # Upgrade package.jsons in init templates
           for pj in $(find packages/aws-cdk/lib/init-templates -name package.json); do
-            (cd $(dirname $pj) && ncu --upgrade --reject='@types/node,@types/fs-extra,constructs,typescript,aws-sdk,aws-sdk-mock,${{ steps.list-packages.outputs.list }}')
+            (cd $(dirname $pj) && ncu --upgrade --reject='@types/node,@types/fs-extra,constructs,typescript,aws-sdk,aws-sdk-mock,ts-jest,jest,${{ steps.list-packages.outputs.list }}')
           done
 
       # This will ensure the current lockfile is up-to-date with the dependency specifications (necessary for "yarn update" to run)

packages/aws-cdk/lib/init-templates/v1/app/javascript/package.json

@@ -12,7 +12,7 @@
   "devDependencies": {
     "@aws-cdk/assertions": "%cdk-version%",
     "aws-cdk": "%cdk-version%",
-    "jest": "^28.1.0"
+    "jest": "^27.5.1"
   },
   "dependencies": {
     "@aws-cdk/core": "%cdk-version%"

packages/aws-cdk/lib/init-templates/v1/app/typescript/package.json

@@ -14,8 +14,8 @@
     "@aws-cdk/assertions": "%cdk-version%",
     "@types/jest": "^27.5.0",
     "@types/node": "10.17.27",
-    "jest": "^28.1.0",
-    "ts-jest": "^28.0.2",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
     "aws-cdk": "%cdk-version%",
     "ts-node": "^10.7.0",
     "typescript": "~3.9.7"

packages/aws-cdk/lib/init-templates/v1/lib/typescript/package.json

@@ -12,8 +12,8 @@
     "@aws-cdk/assertions": "%cdk-version%",
     "@types/jest": "^27.5.0",
     "@types/node": "10.17.27",
-    "jest": "^28.1.0",
-    "ts-jest": "^28.0.2",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
     "typescript": "~3.9.7"
   },
   "peerDependencies": {

packages/aws-cdk/lib/init-templates/v1/sample-app/javascript/package.json

@@ -12,7 +12,7 @@
   "devDependencies": {
     "@aws-cdk/assertions": "%cdk-version%",
     "aws-cdk": "%cdk-version%",
-    "jest": "^28.1.0"
+    "jest": "^27.5.1"
   },
   "dependencies": {
     "@aws-cdk/aws-sns": "%cdk-version%",

packages/aws-cdk/lib/init-templates/v1/sample-app/typescript/package.json

@@ -15,8 +15,8 @@
     "@aws-cdk/assertions": "%cdk-version%",
     "@types/jest": "^27.5.0",
     "@types/node": "10.17.27",
-    "jest": "^28.1.0",
-    "ts-jest": "^28.0.2",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
     "ts-node": "^10.7.0",
     "typescript": "~3.9.7"
   },

packages/aws-cdk/lib/init-templates/v2/app/javascript/package.json

@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "aws-cdk": "%cdk-version%",
-    "jest": "^28.1.0"
+    "jest": "^27.5.1"
   },
   "dependencies": {
     "aws-cdk-lib": "%cdk-version%",

packages/aws-cdk/lib/init-templates/v2/app/typescript/package.json

@@ -13,8 +13,8 @@
   "devDependencies": {
     "@types/jest": "^27.5.0",
     "@types/node": "10.17.27",
-    "jest": "^28.1.0",
-    "ts-jest": "^28.0.2",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
     "aws-cdk": "%cdk-version%",
     "ts-node": "^10.7.0",
     "typescript": "~3.9.7"

packages/aws-cdk/lib/init-templates/v2/lib/typescript/package.json

@@ -13,8 +13,8 @@
     "@types/node": "10.17.27",
     "aws-cdk-lib": "%cdk-version%",
     "constructs": "%constructs-version%",
-    "jest": "^28.1.0",
-    "ts-jest": "^28.0.2",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
     "typescript": "~3.9.7"
   },
   "peerDependencies": {

packages/aws-cdk/lib/init-templates/v2/sample-app/javascript/package.json

@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "aws-cdk": "%cdk-version%",
-    "jest": "^28.1.0"
+    "jest": "^27.5.1"
   },
   "dependencies": {
     "aws-cdk-lib": "%cdk-version%",

packages/aws-cdk/lib/init-templates/v2/sample-app/typescript/package.json

@@ -14,8 +14,8 @@
     "aws-cdk": "%cdk-version%",
     "@types/jest": "^27.5.0",
     "@types/node": "10.17.27",
-    "jest": "^28.1.0",
-    "ts-jest": "^28.0.2",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.4",
     "ts-node": "^10.7.0",
     "typescript": "~3.9.7"
   },