CI: Switch service availability checks to macOS runners

Linux runners exhibit connectivity issues with some services that are
not present with macOS runners. Switching to macOS thus reduces chances
for false positives.

.github/workflows/dispatch.yaml

@@ -34,7 +34,7 @@ jobs:
   services-validation:
     name: Check Services Configuration Files 🕵️
     if: github.repository_owner == 'obsproject' && inputs.job == 'services'
-    runs-on: ubuntu-22.04
+    runs-on: macos-13
     permissions:
       checks: write
     steps:

.github/workflows/scheduled.yaml

@@ -12,7 +12,7 @@ jobs:
   services-availability:
     name: Check Service Availability 🛜
     if: github.repository_owner == 'obsproject'
-    runs-on: ubuntu-22.04
+    runs-on: macos-13
     permissions:
       checks: write
     steps: