ci: Update to Rust 1.93

Author: mbuesch

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         toolchain:
           - 1.75.0 # MSRV
-          - 1.92.0
+          - 1.93.0
         os:
           - ubuntu-latest
           - windows-latest