ci: update actions to Node.js 24 to fix deprecation warnings

- actions/checkout v4 → v5
- dorny/paths-filter v3 → v4

Node.js 20 actions will be forced to Node.js 24 starting June 2, 2026,
and removed from runners September 16, 2026.

https://claude.ai/code/session_01EZcsmvQWmaAJDM6KXL1RoT

Author: claude

.github/workflows/builds.yml

@@ -15,8 +15,8 @@ jobs:
             builds: ${{ steps.filter.outputs.builds }}
             installer: ${{ steps.filter.outputs.installer }}
         steps:
-            - uses: actions/checkout@v4
-            - uses: dorny/paths-filter@v3
+            - uses: actions/checkout@v5
+            - uses: dorny/paths-filter@v4
               id: filter
               with:
                 filters: |
@@ -58,7 +58,7 @@ jobs:
             image: ${{ matrix.image }}
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - name: System Basic Packages
               run: |
                   if command -v apt-get; then