Remove macos-14 runner from swift build (#2484)

Temporarily disable self-hosted runners (`macos-14`) until official GH
runners can back them up.

.github/workflows/swift.yml

@@ -29,14 +29,18 @@ jobs:
             platform: iOS
             destination: generic/platform=iOS
             xcode: "15.0"
-          - sdk: macosx
-            runs-on: macos-14
-            platform: macOS
-            destination: platform=macOS
-          - sdk: iphoneos
-            runs-on: macos-14
-            platform: iOS
-            destination: generic/platform=iOS
+          # TODO: Enable when GH Actions has macos-14 runners. Until this, this depends
+          # on self-hosted runners which can be less reliable and have issues with things
+          # like sccache.
+          # See https://github.com/firezone/firezone/actions/runs/6608338431/job/17946908445
+          # - sdk: macosx
+          #   runs-on: macos-14
+          #   platform: macOS
+          #   destination: platform=macOS
+          # - sdk: iphoneos
+          #   runs-on: macos-14
+          #   platform: iOS
+          #   destination: generic/platform=iOS
     permissions:
       contents: read
       id-token: 'write'