Bump actions/setup-java from v1 to v2

Bumps [actions/setup-java](https://github.com/actions/setup-java) from v1 to v2.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v1...8764a52)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/generate_javadoc.yml

@@ -15,7 +15,7 @@ jobs:
       with:
         ref: 'master'
     - name: Set up Java 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v2
       with:
         java-version: 1.11
     - name: Generate Javadoc
@@ -34,7 +34,7 @@ jobs:
     - name: Checkout Code
       uses: actions/checkout@v2.3.4
     - name: Set up Java 11
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v2
       with: 
         java-version: 1.11
     - name: Generate Jars