Fix format workflow (gonzalezreal#329)

Author: gonzalezreal

.github/workflows/format.yml

@@ -6,15 +6,13 @@ on:
 jobs:
   format:
     name: swift-format
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
-      - uses: actions/checkout@v2
-      - name: Select Xcode 14.2
-        run: sudo xcode-select -s /Applications/Xcode_14.2.app
-      - name: Tap
-        run: brew tap pointfreeco/formulae
+      - uses: actions/checkout@v4
+      - name: Select Xcode
+        run: sudo xcode-select -s /Applications/Xcode_15.0.app
       - name: Install
-        run: brew install Formulae/swift-format@5.7
+        run: brew install swift-format
       - name: Format
         run: make format
       - uses: stefanzweifel/git-auto-commit-action@v4