fix: use forked cache-apt-pkgs-action with Node 24 support

Upstream awalsh128/cache-apt-pkgs-action@latest pins actions/cache@v4
(Node 20, deprecated). Use jetthoughts fork with actions/cache@v5
(Node 24) until upstream merges the fix.

Upstream PR: awalsh128/cache-apt-pkgs-action#198

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pftg

.github/actions/setup-ruby-and-dependencies/action.yml

@@ -27,7 +27,7 @@ runs:
 
     - name: Install and cache vips
       if: ${{ inputs.cache-apt-packages == 'true' }}
-      uses: awalsh128/cache-apt-pkgs-action@latest
+      uses: jetthoughts/cache-apt-pkgs-action@fix/upgrade-actions-cache-v5
       with:
         packages: libvips libglib2.0-0 libglib2.0-dev libwebp-dev libvips42 libpng-dev
         version: tests-v2