Upgrade GitHub Actions for Node 24 compatibility (#2345)

## Summary

Upgrade GitHub Actions to their latest versions to ensure compatibility
with Node 24, as Node 20 will reach end-of-life in April 2026.

## Changes

| Action | Old Version(s) | New Version | Release | Files |
|--------|---------------|-------------|---------|-------|
| `actions/checkout` |
[`v4`](https://github.com/actions/checkout/releases/tag/v4) |
[`v6`](https://github.com/actions/checkout/releases/tag/v6) |
[Release](https://github.com/actions/checkout/releases/tag/v6) |
conventional-commits.yml, dogfooding.yml, publish.yml, release.yml,
test.yml |
| `actions/setup-go` |
[`v5`](https://github.com/actions/setup-go/releases/tag/v5) |
[`v6`](https://github.com/actions/setup-go/releases/tag/v6) |
[Release](https://github.com/actions/setup-go/releases/tag/v6) |
release.yml, test.yml |

## Context

Per [GitHub's
announcement](https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/),
Node 20 is being deprecated and runners will begin using Node 24 by
default starting March 4th, 2026.

### Why this matters

- **Node 20 EOL**: April 2026
- **Node 24 default**: March 4th, 2026
- **Action**: Update to latest action versions that support Node 24

### Security Note

Actions that were previously pinned to commit SHAs remain pinned to SHAs
(updated to the latest release SHA) to maintain the security benefits of
immutable references.

### Testing

These changes only affect CI/CD workflow configurations and should not
impact application functionality. The workflows should be tested by
running them on a branch before merging.

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Author: salmanmkc

.github/workflows/conventional-commits.yml

@@ -26,7 +26,7 @@ jobs:
     env:
       EVENT: ${{ toJSON(github.event) }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           sparse-checkout: |
             .github

.github/workflows/dogfooding.yml

@@ -15,7 +15,7 @@ jobs:
   check_dogfooding:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         if: github.event.pull_request.base.ref == 'master' && github.event.pull_request.head.ref == 'release-please--branches--master'
         with:
           ref: master # used to identify the latest RC version via git describe --tags --match rc*

.github/workflows/publish.yml

@@ -21,7 +21,7 @@ jobs:
       id-token: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - id: meta
         uses: docker/metadata-action@v4

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
           target-branch: ${{ github.ref_name }}
           token: ${{ steps.app-token.outputs.token }}
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         if: ${{ steps.release.outputs.release_created == 'true' || steps.release.outputs.prs_created == 'true' }}
         with:
           fetch-depth: 0
@@ -89,7 +89,7 @@ jobs:
           echo "RELEASE_CANDIDATE=${RELEASE_CANDIDATE}" >> "${GITHUB_OUTPUT}"
           echo "RELEASE_NAME=${RELEASE_NAME}" >> "${GITHUB_OUTPUT}"
 
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         if: ${{ steps.release.outputs.release_created == 'true' || steps.release.outputs.prs_created == 'true' }}
         with:
           go-version-file: go.mod

.github/workflows/test.yml

@@ -29,9 +29,9 @@ jobs:
           --health-retries 5
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
       - name: Check gofmt