chore(identity): don't inherit rust-version from workspace

Another data point in favor of #4742 just popped up. With `libp2p-identity` being part of the workspace, we accidentally published a patch release that bumps the MSRV which is something we normally consider a breaking change.

This PR freezes the MSRV of `libp2p-identity` to avoid this problem in the future. Long-term, we should do #4742 to avoid these kind of mistakes instead of special-casing crates within the repository.

Pull-Request: #4866.

Author: thomaseizinger

identity/Cargo.toml

@@ -3,7 +3,7 @@ name = "libp2p-identity"
 version = "0.2.8"
 edition = "2021"
 description = "Data structures and algorithms for identifying peers in libp2p."
-rust-version = { workspace = true }
+rust-version = "1.73.0" # MUST NOT inherit from workspace because we don't want to publish breaking changes to `libp2p-identity`.
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"
 keywords = ["peer-to-peer", "libp2p", "networking", "cryptography"]