fix: increase timeout for jobs that install apt packages

Functional Test and Test Drivers install libvips via apt — on cache miss
this can take 5+ minutes. Bump from 5 to 10 minutes.

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

Author: pftg

.github/workflows/test.yml

@@ -60,7 +60,7 @@ jobs:
   functional-test:
     name: Functional Test
     runs-on: ubuntu-latest
-    timeout-minutes: 5
+    timeout-minutes: 10
     permissions:
       contents: read
       pull-requests: write
@@ -197,7 +197,7 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    timeout-minutes: 5
+    timeout-minutes: 10
 
     steps:
       - uses: actions/checkout@v6