Fix: Run clippy with exact toolchains

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

Author: matthiasbeyer

.github/workflows/msrv.yml

@@ -96,7 +96,7 @@ jobs:
       matrix:
         rust:
           - 1.66.0
-          - stable
+          - 1.73.0
     steps:
       - name: Checkout sources
         uses: actions/checkout@v4.1.0
@@ -118,7 +118,7 @@ jobs:
       matrix:
         rust:
           - 1.66.0
-          - stable
+          - 1.73.0
 
     steps:
       - name: Checkout sources