ci: switch to Ubuntu 22.04 runner for Linux build

Author: Integral-Tech

.github/workflows/build.yml

@@ -68,7 +68,7 @@ jobs:
 
   build-linux-x64:
     name: Build Linux x86-64
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
@@ -93,7 +93,7 @@ jobs:
 
   build-linux-arm64:
     name: Build Linux ARM64
-    runs-on: ubuntu-24.04-arm
+    runs-on: ubuntu-22.04-arm
     steps:
       - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2