Set correct MSRV (1.70.0)

Author: cyqsimon

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         rust:
-          - 1.65.0 # MSRV
+          - 1.70.0 # MSRV
           - stable
           - nightly
     steps: