Bump Gradle Wrapper to 9.6.1, wrapper checksums, and Develocity plugin to 4.5.0 (#1034)

Consolidates seven open bot PRs into three commits.

## 1. Bump Gradle Wrapper from 9.5.1 to 9.6.1

Combines **#1008, #1009, #1010, #1011, #1012** into a single commit.
Each of those PRs bumped the wrapper in one directory; this covers all
five (15 files):

- `sources/test/init-scripts`
- `.github/workflow-samples/gradle-plugin`
- `.github/workflow-samples/groovy-dsl`
- `.github/workflow-samples/java-toolchain`
- `.github/workflow-samples/kotlin-dsl`

Each location gets the same `distributionUrl` → `gradle-9.6.1-bin.zip`
and `distributionSha256Sum` update, plus the regenerated `gradlew` /
`gradlew.bat` scripts.

## 2. Update known wrapper checksums

**#990**, unchanged, as its own commit. Adds 36 checksum entries to
`sources/src/wrapper-validation/wrapper-checksums.json`, **including the
9.6.1 checksums** — which is what lets the wrapper bump above pass
`CI-validate-wrappers`. These two are worth landing together.

## 3. Bump Develocity Gradle plugin from 4.4.2 to 4.5.0

**#1015**, unchanged, as its own commit. Updates the plugin reference
across workflow samples, init-script tests, docs, and the injected
default in `sources/src/develocity/build-scan.ts`:

```diff
-maybeExportVariable('DEVELOCITY_INJECTION_DEVELOCITY_PLUGIN_VERSION', '4.4.2')
+maybeExportVariable('DEVELOCITY_INJECTION_DEVELOCITY_PLUGIN_VERSION', '4.5.0')
```

Since this touches `sources/src`, the bundled `dist/` will change when
the update-dist bot runs.

## Verification

All three cherry-picks applied without conflicts. On the combined
branch:

- `./build` — clean
- `npm run check` (prettier + eslint) — clean
- `npm test` — 373 tests, 15 suites, all passing

Original bot authorship is preserved on all three commits.

## Superseded PRs

Once this merges, these can be closed: #1008, #1009, #1010, #1011,
#1012, #990, #1015.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: bot-githubaction <bot-githubaction@gradle.com>

sources/src/develocity/build-scan.ts

@@ -33,7 +33,7 @@ export function setup(config: DevelocityConfig): void {
     // except if they are defined in the configuration
     if (config.getBuildScanPublishEnabled()) {
         maybeExportVariable('DEVELOCITY_INJECTION_ENABLED', 'true')
-        maybeExportVariable('DEVELOCITY_INJECTION_DEVELOCITY_PLUGIN_VERSION', '4.4.2')
+        maybeExportVariable('DEVELOCITY_INJECTION_DEVELOCITY_PLUGIN_VERSION', '4.5.0')
         maybeExportVariable('DEVELOCITY_INJECTION_CCUD_PLUGIN_VERSION', '2.1')
         maybeExportVariable('DEVELOCITY_INJECTION_TERMS_OF_USE_URL', config.getTermsOfUseUrl())
         maybeExportVariable('DEVELOCITY_INJECTION_TERMS_OF_USE_AGREE', config.getTermsOfUseAgree())

sources/src/wrapper-validation/wrapper-checksums.json

@@ -1,4 +1,40 @@
 [
+  {
+    "version": "9.7.0-rc-2",
+    "checksum": "7a9ce74cff467ca1bf60a4fcd9f05185acceda4d0f382434d393e17864262c5d"
+  },
+  {
+    "version": "9.7.0-rc-1",
+    "checksum": "7a9ce74cff467ca1bf60a4fcd9f05185acceda4d0f382434d393e17864262c5d"
+  },
+  {
+    "version": "9.7.0-milestone-3",
+    "checksum": "7a9ce74cff467ca1bf60a4fcd9f05185acceda4d0f382434d393e17864262c5d"
+  },
+  {
+    "version": "9.7.0-milestone-2",
+    "checksum": "7a9ce74cff467ca1bf60a4fcd9f05185acceda4d0f382434d393e17864262c5d"
+  },
+  {
+    "version": "9.6.1",
+    "checksum": "497c8c2a7e5031f6aa847f88104aa80a93532ec32ee17bdb8d1d2f67a194a9c7"
+  },
+  {
+    "version": "9.6.0",
+    "checksum": "497c8c2a7e5031f6aa847f88104aa80a93532ec32ee17bdb8d1d2f67a194a9c7"
+  },
+  {
+    "version": "9.7.0-milestone-1",
+    "checksum": "8a23bf708fd4e02674e77fb34b0fa7c02f0d53c2ad377385ab507422313d26d1"
+  },
+  {
+    "version": "9.6.0-rc-3",
+    "checksum": "497c8c2a7e5031f6aa847f88104aa80a93532ec32ee17bdb8d1d2f67a194a9c7"
+  },
+  {
+    "version": "9.6.0-rc-2",
+    "checksum": "497c8c2a7e5031f6aa847f88104aa80a93532ec32ee17bdb8d1d2f67a194a9c7"
+  },
   {
     "version": "9.6.0-rc-1",
     "checksum": "497c8c2a7e5031f6aa847f88104aa80a93532ec32ee17bdb8d1d2f67a194a9c7"