build(deps): bump golangci/golangci-lint-action from 8 to 9

Bumps [golangci/golangci-lint-action](https://github.com/golangci/golangci-lint-action) from 8 to 9.
- [Release notes](https://github.com/golangci/golangci-lint-action/releases)
- [Commits](golangci/golangci-lint-action@v8...v9)

---
updated-dependencies:
- dependency-name: golangci/golangci-lint-action
  dependency-version: '9'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/validate.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: 1.25.x
-      - uses: golangci/golangci-lint-action@v8
+      - uses: golangci/golangci-lint-action@v9
         with:
           version: v2.5
 
@@ -62,7 +62,7 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: 1.25.x
-      - uses: golangci/golangci-lint-action@v8
+      - uses: golangci/golangci-lint-action@v9
         with:
           version: v2.5
       - name: test-stubs