ci: update workflows to use macos-26 and Xcode 26.0

Author: coenttb

.github/workflows/swift-format.yml

@@ -12,14 +12,14 @@ concurrency:
 jobs:
   swift_format:
     name: swift-format
-    runs-on: macos-15
+    runs-on: macos-26
     permissions:
       contents: write
     steps:
       - uses: actions/checkout@v5
 
       - name: Select Xcode
-        run: sudo xcode-select -s /Applications/Xcode_16.0.app
+        run: sudo xcode-select -s /Applications/Xcode_26.0.app
 
       - name: Cache swift-format
         id: cache-swift-format

.github/workflows/swiftlint.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   swiftlint:
     name: Check Code Quality
-    runs-on: macos-15
+    runs-on: macos-26
     steps:
       - uses: actions/checkout@v5