Update workflows to use Xcode 16

Author: msaps

.github/workflows/build.yml

@@ -9,6 +9,9 @@ jobs:
     runs-on: macOS-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: maxim-lobanov/setup-xcode@v1
+          with:
+            xcode-version: '16.0.0'
       - name: Prepare
         run: |
           bundle update --bundler

.github/workflows/publish.yml

@@ -9,6 +9,9 @@ jobs:
     runs-on: macOS-latest
     steps:
       - uses: actions/checkout@v2
+      - uses: maxim-lobanov/setup-xcode@v1
+          with:
+            xcode-version: '16.0.0'
       - name: Prepare
         run: |
           bundle update --bundler