Delete update_rust_toolchains.yml (#1698)

.github/workflows/update_rust_toolchain.yml

@@ -1,28 +0,0 @@
-name: Update Rust toolchain
-
-on:
-  schedule:
-    - cron: '0 0 * * *'  # Debug
-
-jobs:
-  update-rust-toolchains:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-        with:
-          ref: update_from_ci
-      - uses: actions/setup-python@v3
-        with:
-          python-version: '3.10' 
-
-      - name: Setup Git
-        run: |
-          git config --local user.email "actions@github.com"
-          git config --local user.name "GitHub Actions"
-
-      - name: Commit & push data
-        run: |
-          sed -i 's/rustup toolchain install nightly[0-9a-zA-Z\-]*/\`date +"rustup toolchain install nightly-%Y-%m-%d"\`/' ./.github/workflows/build_and_test.yml
-          git add -u
-          git commit -m "Update rust toolchain & time [$(date +'%Y-%m-%d %H:%M')]"
-          git push