Bump Gradle Wrappers (#499)

# Combined PRs ➡️📦⬅️

✅ The following pull requests have been successfully combined on this
PR:
- Closes #498 Bump Gradle Wrapper from 8.11.1 to 8.12 in
/.github/workflow-samples/kotlin-dsl
- Closes #497 Bump Gradle Wrapper from 8.11.1 to 8.12 in
/.github/workflow-samples/java-toolchain
- Closes #496 Bump Gradle Wrapper from 8.11.1 to 8.12 in
/.github/workflow-samples/groovy-dsl
- Closes #495 Bump Gradle Wrapper from 8.11.1 to 8.12 in
/.github/workflow-samples/gradle-plugin
- Closes #494 Bump Gradle Wrapper from 8.11.1 to 8.12 in
/sources/test/init-scripts

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.github/workflows/integ-test-provision-gradle-versions.yml

@@ -78,7 +78,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        gradle: ["8.11.1", 8.9, 8.1, 7.6.4, 6.9.4, 5.6.4, 4.10.3, 3.5.1]
+        gradle: ["8.12", 8.9, 8.1, 7.6.4, 6.9.4, 5.6.4, 4.10.3, 3.5.1]
         os: ${{fromJSON(inputs.runner-os)}}
         include:
           - java-version: 11