ci: use MSRV for lints

All other CI jobs use MSRV, and all lints have started failing with same error as #1585

Author: claytonrcarter

.github/workflows/lint.yml

@@ -30,7 +30,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: stable
+          toolchain: 1.74
           components: rustfmt, clippy
           override: true