chore: bump object_store MSRV to 1.70

Author: oherrala

object_store/Cargo.toml

@@ -24,7 +24,7 @@ readme = "README.md"
 description = "A generic object store interface for uniformly interacting with AWS S3, Google Cloud Storage, Azure Blob Storage and local files."
 keywords = ["object", "storage", "cloud"]
 repository = "https://github.com/apache/arrow-rs/tree/main/object_store"
-rust-version = "1.64.0"
+rust-version = "1.70.0"
 
 [package.metadata.docs.rs]
 all-features = true