feat: Update stable to 1.50

Author: kraigher

.github/workflows/build-test-all.yml

@@ -23,7 +23,7 @@ jobs:
           - x86_64-pc-windows-msvc
         rust:
           - stable
-          - 1.40.0 # MSRV
+          - 1.50.0 # MSRV
 
         include:
           - target: x86_64-unknown-linux-gnu