Bump java dependency to 9.x

Author: lemmy

.github/workflows/main.yml

@@ -9,10 +9,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
+    - name: Set up JDK 1.9
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: 9.0.x
     - name: Get current date
       id: date
       run: echo "::set-output name=date::$(date +'%Y%m%d%H%M')"
@@ -37,4 +37,4 @@ jobs:
         upload_url: ${{ steps.create_release.outputs.upload_url }}
         asset_path: dist/CommunityModules-${{steps.date.outputs.date}}.jar
         asset_name: CommunityModules-${{steps.date.outputs.date}}.jar
-        asset_content_type: application/zip
+        asset_content_type: application/zip