Update macOS runner version from 14 to 26

Author: CodeDoctorDE

.github/workflows/build.yml

@@ -413,7 +413,7 @@ jobs:
           name: linux-${{ matrix.arch.name }}-snap
           path: ${{ steps.build.outputs.snap }}
   build-macos:
-    runs-on: macos-14
+    runs-on: macos-26
     defaults:
       run:
         working-directory: app
@@ -470,7 +470,7 @@ jobs:
 
   build-ipa:
     name: build-ipa (iOS)
-    runs-on: macos-14
+    runs-on: macos-26
     defaults:
       run:
         working-directory: app