raise MSRV for async-global-executor

Author: 0xpr03

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         version:
-          - 1.56.0 # MSRV
+          - 1.59.0 # MSRV
           - stable
           - nightly
         os: [ubuntu-latest, macos-latest, windows-latest]