Updates java version in push notification workflow (#187)

* Updates java version in push notification workflow

* Update push-notification-jar.yml

updated java version and cacert path in gradle command

Co-authored-by: Rishabh Singh <[email protected]>

Author: dbbaughe

.github/workflows/push-notification-jar.yml

@@ -22,14 +22,14 @@ jobs:
       - name: Setup Java
         uses: actions/setup-java@v1
         with:
-          java-version: '12'
+          java-version: '13'
 
       - name: Upload Notification Jar to Maven
         env:
           passphrase: ${{ secrets.PASSPHRASE }}
         run: |
           cd ..
-          export JAVA12_HOME=$JAVA_HOME
+          export JAVA13_HOME=$JAVA_HOME
           aws s3 cp s3://opendistro-docs/github-actions/pgp-public-key .
           aws s3 cp s3://opendistro-docs/github-actions/pgp-private-key .
           
@@ -41,4 +41,4 @@ jobs:
           
           cd alerting/notification
           
-          ../gradlew publishShadowPublicationToSonatype-stagingRepository -Dcompiler.java=12 -Dbuild.snapshot=false -Djavax.net.ssl.trustStore=/opt/hostedtoolcache/jdk/12.0.2/x64/lib/security/cacerts
+          ../gradlew publishShadowPublicationToSonatype-stagingRepository -Dcompiler.java=13 -Dbuild.snapshot=false -Djavax.net.ssl.trustStore=/opt/hostedtoolcache/jdk/13.0.2/x64/lib/security/cacerts