Update developer dir

Author: tomlokhorst

.github/workflows/checks.yml

@@ -7,7 +7,7 @@ on:
     branches: '*'
 
 env:
-  DEVELOPER_DIR: /Applications/Xcode_11.4.app/Contents/Developer
+  DEVELOPER_DIR: /Applications/Xcode_12.4.app/Contents/Developer
 
 jobs:
   iOS:
@@ -30,4 +30,4 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v2
     - name: Build
-      run: xcodebuild -scheme "Rswift-watchOS"
+      run: xcodebuild -scheme "Rswift-watchOS"

.github/workflows/release.yml

@@ -5,7 +5,7 @@ on:
     types: created
 
 env:
-  DEVELOPER_DIR: /Applications/Xcode_11.4.app/Contents/Developer
+  DEVELOPER_DIR: /Applications/Xcode_12.4.app/Contents/Developer
 
 jobs:
   publish: