home: reduce MSRV to 1.64

Author: djc

crates/home/Cargo.toml

@@ -2,7 +2,7 @@
 name = "home"
 version = "0.5.11"
 authors = ["Brian Anderson <[email protected]>"]
-rust-version = "1.73"  # MSRV:3
+rust-version = "1.64"  # MSRV:3
 documentation = "https://docs.rs/home"
 edition.workspace = true
 include = [