Replace manual CI pins with lockfile

Author: TheBlueMatt

.github/workflows/build.yml

@@ -30,18 +30,15 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
           override: true
           profile: minimal
-      - name: Pin dependencies
-        if: ${{ matrix.toolchain == '1.63.0' }}
-        run: |
-          cargo update -p tokio --precise "1.38.1" --verbose
-          cargo update -p postgres-types --precise "0.2.6" --verbose
-          cargo update -p parking_lot@0.12.4 --precise "0.12.3" --verbose
-          cargo update -p parking_lot_core@0.9.11 --precise "0.9.10" --verbose
-          cargo update -p lock_api --precise "0.4.12" --verbose
       - name: Build on Rust ${{ matrix.toolchain }}
         run: |
           cargo build --verbose --color always
   test:
+    strategy:
+      matrix:
+        toolchain:
+          - stable
+          - 1.63.0
     runs-on: ubuntu-latest
     services:
       postgres:
@@ -61,7 +58,7 @@ jobs:
       - name: Install Rust ${{ matrix.toolchain }} toolchain
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: ${{ matrix.toolchain }}
           override: true
           profile: minimal
       - name: Run tests