Update actions/setup-java to v2.

Author: garydgregory

.github/workflows/maven.yml

@@ -39,8 +39,9 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-maven-
     - name: Set up JDK ${{ matrix.java }}
-      uses: actions/setup-java@v1.4.3
+      uses: actions/setup-java@v2
       with:
+        distribution: 'adopt'
         java-version: ${{ matrix.java }}
     - name: Build with Maven
       run: mvn -V --file pom.xml --no-transfer-progress

src/changes/changes.xml

@@ -62,8 +62,8 @@
       <action type="update" dev="ggregory" due-to="Dependabot">
         Bump actions/checkout from v2.3.1 to v2.3.2 #46.
       </action>
-     <action type="update" dev="ggregory" due-to="Dependabot">
-        Bump actions/setup-java from v1.4.2 to v1.4.3 #50.
+     <action type="update" dev="ggregory" due-to="Dependabot, Gary Gregory">
+        Bump actions/setup-java from v1.4.2 to v2 #50.
       </action>
      <action type="update" dev="ggregory" due-to="Elliotte Rusty Harold">
         Option Javadocs grammar nits #55.