Bump hashbrown from 0.2.2 to 0.3.1 (#5381)

Bumps [hashbrown](https://github.com/rust-lang/hashbrown) from 0.2.2 to 0.3.1.
- [Release notes](https://github.com/rust-lang/hashbrown/releases)
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/hashbrown/compare/v0.2.2...v0.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

core/Cargo.toml

@@ -28,7 +28,7 @@ crossbeam-channel = "0.3"
 dir-diff = "0.3.1"
 flate2 = "1.0.9"
 fs_extra = "1.1.0"
-hashbrown = "0.2.0"
+hashbrown = "0.3.1"
 indexmap = "1.0"
 itertools = "0.8.0"
 jsonrpc-core = "13.0.0"