ci: clear Node 20 action deprecations

Bump the actions still running on Node.js 20:

- github/codeql-action/upload-sarif@v3 -> @v4 (leaked-secrets-scan). v3 also
  carries a separate 'CodeQL Action v3 deprecated Dec 2026, move to v4'
  warning; v4 runs on Node 24 and clears both.
- softprops/action-gh-release v2.6.0 -> v3.0.0 (pinned to commit
  b4309332981a82ec1c5618f44dd2e27cc8bfbfda) in both release-smartem-workspace
  and release-smartem-epuplayer. v3.0.0 is a pure runtime bump (Node 20 ->
  Node 24), no functional changes.
- actions/add-to-project@v1.0.2 -> @v2.0.0 (pr-admin). v2.0.0 runs on Node 24.

Verified each target's action.yml declares 'using: node24'. The epuplayer
softprops pin did not surface in recent annotations (stale run predating the
Node 20 annotation rollout) but resolves to Node 20 statically.

Author: vredchenko

.github/workflows/leaked-secrets-scan.yml

@@ -33,7 +33,7 @@ jobs:
         run: gitleaks detect --source . --redact -c .gitleaks.toml -v --report-format sarif --report-path gitleaks-report.sarif
       - name: Upload SARIF to code scanning
         if: always()
-        uses: github/codeql-action/upload-sarif@v3
+        uses: github/codeql-action/upload-sarif@v4
         with:
           sarif_file: gitleaks-report.sarif
           category: gitleaks

.github/workflows/pr-admin.yml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
       - name: Add PR to SmartEM project
-        uses: actions/add-to-project@v1.0.2
+        uses: actions/add-to-project@v2.0.0
         with:
           project-url: https://github.com/orgs/DiamondLightSource/projects/51
           github-token: ${{ secrets.PROJECT_TOKEN }}

.github/workflows/release-smartem-epuplayer.yml

@@ -477,7 +477,7 @@ jobs:
           GH_TOKEN: ${{ github.token }}
 
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@26e8ad27a09a225049a7075d7ec1caa2df6ff332 # v2.6.0
+        uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0
         with:
           tag_name: ${{ needs.version.outputs.is_stable == 'true' && format('epuplayer-v{0}', needs.version.outputs.version) || format('epuplayer-v{0}', needs.version.outputs.version) }}
           name: EPUPlayer v${{ needs.version.outputs.version }}

.github/workflows/release-smartem-workspace.yml

@@ -336,7 +336,7 @@ jobs:
           GH_TOKEN: ${{ github.token }}
 
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@26e8ad27a09a225049a7075d7ec1caa2df6ff332 # v2.6.0
+        uses: softprops/action-gh-release@b4309332981a82ec1c5618f44dd2e27cc8bfbfda # v3.0.0
         with:
           tag_name: ${{ needs.version.outputs.is_stable == 'true' && format('smartem-workspace-v{0}', needs.version.outputs.version) || format('smartem-workspace-v{0}', needs.version.outputs.version) }}
           name: smartem-workspace v${{ needs.version.outputs.version }}