removing dependabot and wrapper update to rely on renovate bot instead

.github/dependabot.yml

@@ -1,7 +0,0 @@
-version: 2
-updates:
-- package-ecosystem: gradle
-  directory: /
-  schedule:
-    interval: daily
-  open-pull-requests-limit: 3

.github/workflows/update-gradle-wrapper.yml

@@ -1,17 +0,0 @@
-name: Update Gradle Wrapper
-
-on:
-  schedule:
-    - cron: "0 0 * * *"
-
-jobs:
-  update-gradle-wrapper:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: 'recursive'
-
-      - name: Update Gradle Wrapper
-        uses: gradle-update/update-gradle-wrapper-action@v1