Update ci.yml

Bump MSRV to allow deps that use newer features to be selected.

Author: davidblewett

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ on:
     branches: [master]
 
 env:
-  rust_version: 1.54.0
+  rust_version: 1.61.0
 
 jobs:
   lint: