Update macOS version for CI workflows to macOS-26

Author: bummoblizard

.github/workflows/build.yml

@@ -10,7 +10,7 @@ concurrency:
 jobs:
   deploy:
     name: Deploying to TestFlight
-    runs-on: macOS-15
+    runs-on: macOS-26
 
     steps:
       - name: Checkout repository

.github/workflows/production.yml

@@ -8,7 +8,7 @@ concurrency:
 jobs:
   deploy:
     name: Deploying to App Store
-    runs-on: macOS-15
+    runs-on: macOS-26
 
     steps:
       - name: Checkout repository

.github/workflows/test.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   Linting:
-    runs-on: macOS-15
+    runs-on: macOS-26
     steps:
       - uses: actions/checkout@v3
       - name: Install swift-format