chore: fix spec update does not add new modules (#27215)

Fixes missing new modules in code base.

Manually tested via a run:
- Actions run: https://github.com/aws/aws-cdk/actions/runs/6247982836
- Created PR: #27216 (closed on purpose)

----

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

Author: mrgrain

.github/workflows/spec-update.yml

@@ -15,7 +15,6 @@ jobs:
       contents: read
     runs-on: ubuntu-latest
     steps:
-
       - name: Check Out
         uses: actions/checkout@v4
 
@@ -35,8 +34,14 @@ jobs:
 
       # This will ensure the current lockfile is up-to-date with the dependency specifications
       - name: Install latest version & update lockfile
-        run: |-
-          yarn upgrade @aws-cdk/aws-service-spec @aws-cdk/service-spec-types
+        run: yarn upgrade @aws-cdk/aws-service-spec @aws-cdk/service-spec-types
+
+      # Build @aws-cdk/spec2cdk and run L1 gen script to generate base files for new modules
+      - name: Build @aws-cdk/spec2cdk
+        run: lerna run build --stream --no-progress --skip-nx-cache --scope @aws-cdk/spec2cdk
+      - name: Generate L1s
+        working-directory: packages/aws-cdk-lib
+        run: yarn gen
 
       # Next, create and upload the changes as a patch file. This will later be downloaded to create a pull request
       # Creating a pull request requires write permissions and it's best to keep write privileges isolated.
@@ -80,9 +85,9 @@ jobs:
             feat: update AWS Service Spec
             AWS Service Spec packages to latest versions.
           # Pull Request details
-          title: 'feat: update AWS Service Spec'
+          title: "feat: update AWS Service Spec"
           body: |-
-             AWS Service Spec packages to latest versions.
+            AWS Service Spec packages to latest versions.
           labels: contribution/core,dependencies,auto-approve,pr-linter/exempt-integ-test,pr-linter/exempt-readme,pr-linter/exempt-test
           team-reviewers: aws-cdk-team
           # Github prevents further Github actions to be run if the default Github token is used.