Add toolchain to pin CI (#112)

Author: ncpenke

.github/workflows/test.yml

@@ -14,8 +14,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
-        with: 
-          toolchain: stable
       - name: "build all"
         # We keep these separate since sometimes the derive fails when
         # independently built.
@@ -31,7 +29,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with: 
-          toolchain: stable
           components: clippy
       - name: "clippy --all"
         run: cargo clippy --all --tests -- -D warnings
@@ -43,7 +40,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with: 
-          toolchain: stable
           components: rustfmt
       - name: Run
         run: cargo fmt --all -- --check
@@ -54,8 +50,6 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
-        with: 
-          toolchain: stable
       - uses: Swatinem/rust-cache@v1
       - uses: taiki-e/install-action@nextest
       - name: Run
@@ -69,7 +63,6 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions-rs/toolchain@v1
         with: 
-          toolchain: stable
           components: llvm-tools-preview
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov

rust-toolchain

@@ -0,0 +1 @@
+1.69.0