Remove unused update workflow

.github/workflows/update.yml

@@ -1,26 +0,0 @@
-name: Update dependencies
-
-on:
-  schedule:
-    - cron: '0 0 * * 0' # every week
-  workflow_dispatch:
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  update:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Set up NodeJS
-        uses: actions/setup-node@v4
-        with:
-          cache: npm
-      - name: Update dependencies
-        uses: tree-sitter/parser-update-action@v1.1
-        with:
-          parent-name: c
-          language-name: cpp