Upgrade setup-java GitHub actions to v2 (#7232)

There are two breaking changes between v1 and v2. v2 requires a
java distribution be specified. 'adopt' for AdoptOpenJDK has been
selected. v2 has also dropped support for legacy Java version syntax, so
'1.8' must be become '8'.

.github/workflows/gradle_branch.yml

@@ -13,10 +13,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '8'
     - name: Cache Gradle packages
       uses: actions/cache@v2.1.4
       with:
@@ -28,4 +29,4 @@ jobs:
     - name: Build branch without snapshot
       run: ./gradlew -PreleaseMode=pr build --stacktrace
     - name: Upload to Codecov  
-      uses: codecov/codecov-action@v1
\ No newline at end of file
+      uses: codecov/codecov-action@v1

.github/workflows/gradle_jdk11.yml

@@ -16,9 +16,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v2
       with:
-        java-version: 11
+        distribution: 'adopt'
+        java-version: '11'
     - name: Cache Gradle packages
       uses: actions/cache@v2.1.4
       with:
@@ -30,4 +31,4 @@ jobs:
     - name: Build PR
       run: ./gradlew -PreleaseMode=pr build --stacktrace
     #- name: Upload to Codecov  
-    #  uses: codecov/codecov-action@v1
\ No newline at end of file
+    #  uses: codecov/codecov-action@v1

.github/workflows/gradle_pr.yml

@@ -13,10 +13,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '8'
     - name: Cache Gradle packages
       uses: actions/cache@v2.1.4
       with:
@@ -28,4 +29,4 @@ jobs:
     - name: Build PR
       run: ./gradlew -PreleaseMode=pr build --stacktrace
     - name: Upload to Codecov  
-      uses: codecov/codecov-action@v1
\ No newline at end of file
+      uses: codecov/codecov-action@v1

.github/workflows/gradle_release.yml

@@ -26,10 +26,11 @@ jobs:
       CI_BUILD_NUMBER: ${{ github.run_number }}
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '8'
     - name: Cache Gradle packages
       uses: actions/cache@v2.1.4
       with:

.github/workflows/gradle_snapshot.yml

@@ -23,10 +23,11 @@ jobs:
       CI_BUILD_NUMBER: ${{ github.run_number }}
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up JDK 8
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '8'
     - name: Cache Gradle packages
       uses: actions/cache@v2.1.4
       with:
@@ -42,4 +43,4 @@ jobs:
     - name: Upload to Codecov  
       uses: codecov/codecov-action@v1
     - name: Push Javadocs
-      run: ./push_javadoc.sh
\ No newline at end of file
+      run: ./push_javadoc.sh