chore: Change MSRV

Author: Ed Page

azure-pipelines.yml

@@ -8,7 +8,7 @@ schedules:
 jobs:
 - template: default.yml@templates
   parameters:
-    minrust: 1.31.0
+    minrust: 1.40.0
     codecov_token: $(CODECOV_TOKEN_SECRET)
 - job: "Committed"
   displayName: Lint History