Move checks back to default runners

These jobs are not rate-limiting so we don't need to run them on larger runners.

.github/workflows/__all-platform-bundle.yml

@@ -61,7 +61,7 @@ jobs:
         include:
           - os: ubuntu-latest
             version: nightly-latest
-          - os: macos-latest-xlarge
+          - os: macos-latest
             version: nightly-latest
           - os: windows-latest
             version: nightly-latest

.github/workflows/__swift-custom-build.yml

@@ -59,11 +59,11 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos-latest-xlarge
+          - os: macos-latest
             version: linked
-          - os: macos-latest-xlarge
+          - os: macos-latest
             version: default
-          - os: macos-latest-xlarge
+          - os: macos-latest
             version: nightly-latest
     name: Swift analysis using a custom build command
     if: github.triggering_actor != 'dependabot[bot]'