ci: use lockfile for deps on ci

Author: tharropoulos

.github/workflows/lint-and-test.yml

@@ -40,7 +40,7 @@ jobs:
           node-version: ${{ matrix.node-version }}
           cache: "pnpm"
       - name: Install dependencies
-        run: pnpm install
+        run: pnpm install --frozen-lockfile
       - name: Run ESLint
         run: pnpm lint
       - name: Check types