ci: remove public-api-diff job

.github/workflows/lint.yml

@@ -88,30 +88,3 @@ jobs:
 
       - name: check external types
         run: just check-external-types-all +${{ vars.RUST_VERSION_EXTERNAL_TYPES }}
-
-  public-api-diff:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout main branch
-        uses: actions/checkout@v4
-        with:
-          ref: ${{ github.base_ref }}
-
-      - name: Checkout PR branch
-        uses: actions/checkout@v4
-
-      - name: Install Rust (${{ vars.RUST_VERSION_API_DIFF }})
-        uses: actions-rust-lang/setup-rust-toolchain@v1.10.1
-        with:
-          toolchain: ${{ vars.RUST_VERSION_API_DIFF }}
-
-      - name: Install cargo-public-api
-        uses: taiki-e/install-action@v2.46.20
-        with:
-          tool: cargo-public-api
-
-      - name: Generate API diff
-        run: |
-          for f in $(find -mindepth 2 -maxdepth 2 -name Cargo.toml); do
-            cargo public-api --manifest-path "$f" --simplified diff ${{ github.event.pull_request.base.sha }}..${{ github.sha }}
-          done