build.yml: Update to macos-15

Author: flinteger-code

.github/workflows/build.yml

@@ -7,10 +7,10 @@ on:
 jobs:
   build:
     name: Build
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: recursive
       - name: Use HTTPS
@@ -19,7 +19,7 @@ jobs:
           git config --global url."https://".insteadOf git://
       - name: Build
         run: |
-          xcodebuild\
-            -scheme TreeSitterLanguages-Package\
-            -sdk iphonesimulator\
+          xcodebuild \
+            -scheme TreeSitterLanguages-Package \
+            -sdk iphonesimulator \
             -destination 'platform=iOS Simulator,name=iPhone 15 Pro'