Update to Xcode 11.6, add Swift 5.3 and iOS 14 builds. (#3278)

* Update to Xcode 11.6, add Swift 5.3 and iOS 14 builds.

* Disable iOS 14 tests until Combine issues are fixed.

.github/workflows/ci.yml

@@ -23,16 +23,25 @@ jobs:
     name: Test macOS (5.2)
     runs-on: macOS-latest
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_11.5.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_11.6.app/Contents/Developer
     steps:
       - uses: actions/checkout@v2
       - name: macOS (5.2)
         run: set -o pipefail && env NSUnbufferedIO=YES xcodebuild -project "Alamofire.xcodeproj" -scheme "Alamofire macOS" -destination "platform=macOS" clean test | xcpretty
+  macOS_5_3:
+    name: Test macOS (5.3)
+    runs-on: macOS-latest
+    env: 
+      DEVELOPER_DIR: /Applications/Xcode_12_beta.app/Contents/Developer
+    steps:
+      - uses: actions/checkout@v2
+      - name: macOS (5.3)
+        run: set -o pipefail && env NSUnbufferedIO=YES xcodebuild -project "Alamofire.xcodeproj" -scheme "Alamofire macOS" -destination "platform=macOS" clean test | xcpretty
   Catalyst:
     name: Test Catalyst 
     runs-on: macOS-latest
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_11.5.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_11.6.app/Contents/Developer
     steps:
       - uses: actions/checkout@v2
       - name: Catalyst
@@ -41,19 +50,31 @@ jobs:
     name: Test iOS 
     runs-on: macOS-latest
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_11.5.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_11.6.app/Contents/Developer
     strategy:
       matrix:
-        destination: ["OS=13.5,name=iPhone 11 Pro"] #, "OS=12.4,name=iPhone XS", "OS=11.4,name=iPhone X", "OS=10.3.1,name=iPhone SE"]
+        destination: ["OS=13.6,name=iPhone 11 Pro"] #, "OS=12.4,name=iPhone XS", "OS=11.4,name=iPhone X", "OS=10.3.1,name=iPhone SE"]
     steps:
       - uses: actions/checkout@v2
       - name: iOS - ${{ matrix.destination }}
         run: set -o pipefail && env NSUnbufferedIO=YES xcodebuild -project "Alamofire.xcodeproj" -scheme "Alamofire iOS" -destination "${{ matrix.destination }}" clean test | xcpretty
+  # iOS14:
+  #   name: Test iOS 14
+  #   runs-on: macOS-latest
+  #   env:
+  #     DEVELOPER_DIR: /Applications/Xcode_12_beta.app/Contents/Developer
+  #   strategy:
+  #     matrix:
+  #       destination: ["OS=14.0,name=iPhone 11 Pro"] #, "OS=12.4,name=iPhone XS", "OS=11.4,name=iPhone X", "OS=10.3.1,name=iPhone SE"]
+  #   steps:
+  #     - uses: actions/checkout@v2
+  #     - name: iOS - ${{ matrix.destination }}
+  #       run: set -o pipefail && env NSUnbufferedIO=YES xcodebuild -project "Alamofire.xcodeproj" -scheme "Alamofire iOS" -destination "${{ matrix.destination }}" clean test | xcpretty
   tvOS:
     name: Test tvOS 
     runs-on: macOS-latest
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_11.5.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_11.6.app/Contents/Developer
     strategy:
       matrix:
         destination: ["OS=13.4,name=Apple TV 4K"] #, "OS=11.4,name=Apple TV 4K", "OS=10.2,name=Apple TV 1080p"]
@@ -65,7 +86,7 @@ jobs:
     name: Build watchOS
     runs-on: macOS-latest
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_11.5.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_11.6.app/Contents/Developer
     strategy:
       matrix:
         destination: ["OS=6.2.1,name=Apple Watch Series 5 - 44mm"] #, "OS=4.2,name=Apple Watch Series 3 - 42mm", "OS=3.2,name=Apple Watch Series 2 - 42mm"]
@@ -77,7 +98,7 @@ jobs:
     name: Test with SPM
     runs-on: macOS-latest    
     env: 
-      DEVELOPER_DIR: /Applications/Xcode_11.5.app/Contents/Developer
+      DEVELOPER_DIR: /Applications/Xcode_11.6.app/Contents/Developer
     steps:
       - uses: actions/checkout@v2
       - name: SPM Test