Update CI configs and use stable clippy

Author: oxalica

.github/workflows/ci.yaml

@@ -24,16 +24,22 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
-      - name: Install Rust
-        uses: dtolnay/rust-toolchain@master
-        with:
-          toolchain: ${{ matrix.rust }}
-          components: rust-analyzer
+        uses: actions/checkout@v4
+
+      - name: Install Rust ${{ matrix.rust }}
+        run: |
+          rustup update --no-self-update beta
+          rustup default ${{ matrix.rust }}
+          rustup component add rust-analyzer
+
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2
+
       - name: Install cargo-hack
         # Always use stable rustc to compile cargo-hack, which has MSRV 1.65.
         # https://github.com/taiki-e/cargo-hack/commit/5baa4262710414ebde4845494f1db22643acc0ba
         run: cargo +stable install cargo-hack
+
       # `cargo build` doesn't pull in [dev-dependencies].
       - name: Build
         run: cargo hack build --each-feature
@@ -55,13 +61,15 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
+
+      # Sync with Cargo.toml!
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@master
-        with:
-          # Sync with Cargo.toml!
-          toolchain: "1.64"
-          components: rust-analyzer
+        run: |
+          rustup update --no-self-update stable
+          rustup default 1.64
+          rustup component add rust-analyzer
+
       - name: Build
         # Workaround of `-Z avoid-dev-deps`
         # See: https://github.com/rust-lang/cargo/issues/5133#issuecomment-1307094647
@@ -74,20 +82,31 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 45
     steps:
-      - uses: actions/checkout@v3
-      - uses: dtolnay/rust-toolchain@clippy
-      - run: cargo clippy --all-targets --all-features -- -Dclippy::all
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        run: |
+          rustup update --no-self-update stable
+          rustup default stable
+
+      - run: |
+          cargo clippy --all-targets --all-features -- -Dclippy::all
 
   docs:
     name: Docs
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
-      - name: Install clippy
-        uses: dtolnay/rust-toolchain@clippy
-      - name: Rustdoc
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        run: |
+          rustup update --no-self-update stable
+          rustup default stable
+
+      - name: cargo doc
         env:
           RUSTDOCFLAGS: --cfg docsrs_ -Dwarnings
         run: cargo doc --all-features

.github/workflows/future_proof.yaml

@@ -17,8 +17,10 @@ jobs:
     timeout-minutes: 45
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
+
       - name: Install cargo-outdated
         uses: dtolnay/install@cargo-outdated
+
       - name: cargo-outdated
         run: rm -f Cargo.lock && cargo outdated --workspace --exit-code 1 --root-deps-only --exclude=clap,anstyle,clap_lex,regex,lsp-types