chore: fix typo in lambda nodejs16.x runtime (#20264)

Fixed a typo in this earlier PR: #20261 , and re-ran the integration tests. 

----

### All Submissions:

* [x] 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

* [x] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [x] 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: madeline-k

packages/@aws-cdk/aws-lambda/lib/runtime.ts

@@ -83,7 +83,7 @@ export class Runtime {
   /**
    * The NodeJS 16.x runtime (nodejs16.x)
    */
-  public static readonly NODEJS_16_X = new Runtime('nodejs14.x', RuntimeFamily.NODEJS, { supportsInlineCode: true });
+  public static readonly NODEJS_16_X = new Runtime('nodejs16.x', RuntimeFamily.NODEJS, { supportsInlineCode: true });
 
   /**
    * The Python 2.7 runtime (python2.7)

packages/@aws-cdk/aws-lambda/test/runtime.inlinecode.integ.snapshot/aws-cdk-lambda-runtime-inlinecode.template.json

@@ -344,7 +344,7 @@
      ]
     },
     "Handler": "index.handler",
-    "Runtime": "nodejs14.x"
+    "Runtime": "nodejs16.x"
    },
    "DependsOn": [
     "NODEJS16XServiceRoleB9DAFDFD"

packages/@aws-cdk/aws-lambda/test/runtime.inlinecode.integ.snapshot/cdk.out

@@ -1 +1 @@
-{"version":"17.0.0"}
+{"version":"18.0.0"}

packages/@aws-cdk/aws-lambda/test/runtime.inlinecode.integ.snapshot/integ.json

@@ -1,7 +1,7 @@
 {
   "version": "18.0.0",
   "testCases": {
-    "aws-lambda/test/integ.runtime.inlinecode": {
+    "integ.runtime.inlinecode": {
       "stacks": [
         "aws-cdk-lambda-runtime-inlinecode"
       ],

packages/@aws-cdk/aws-lambda/test/runtime.inlinecode.integ.snapshot/tree.json

@@ -631,7 +631,7 @@
                       ]
                     },
                     "handler": "index.handler",
-                    "runtime": "nodejs14.x"
+                    "runtime": "nodejs16.x"
                   }
                 },
                 "constructInfo": {