ci: update gradle

Author: bconlon1

.github/workflows/publish-curseforge.yml

@@ -14,7 +14,7 @@ jobs:
         java-version: 17
     - uses: gradle/gradle-build-action@v2.4.2
       with:
-        gradle-version: 7.3
+        gradle-version: 8.1
     - name: Publish build
       env:
         CURSEFORGE_TOKEN: ${{ secrets.CURSEFORGE_TOKEN }}

.github/workflows/publish-modrinth.yml

@@ -14,7 +14,7 @@ jobs:
         java-version: 17
     - uses: gradle/gradle-build-action@v2.4.2
       with:
-        gradle-version: 7.3
+        gradle-version: 8.1
     - name: Publish build
       env:
         MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}