MSRV 1.91.1

To get updated AWS SDK etc

Author: sourcefrog

Cargo.toml

@@ -9,7 +9,7 @@ name = "conserve"
 readme = "README.md"
 repository = "https://github.com/sourcefrog/conserve/"
 version = "23.11.0"
-rust-version = "1.88"
+rust-version = "1.91.1"
 
 [features]
 default = ["s3", "sftp"]