GH-45 Update actions/upload-artifact action to v3.1.2 (#45)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/gradle.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Build the Jar
         run: './gradlew bukkit:shadowJar'
       - name: Upload a Build Artifact
-        uses: actions/[email protected].1
+        uses: actions/[email protected].2
         with:
           name: 'Successfully build EternalRTP JDK${{ matrix.jdk }}'
           path: bukkit/build/libs/EternalRTP*.jar