Bump regex from 1.9.1 to 1.9.3 in /lang/rust (#2426)

Bumps [regex](https://github.com/rust-lang/regex) from 1.9.1 to 1.9.3.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.9.1...1.9.3)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

lang/rust/avro/Cargo.toml

@@ -63,7 +63,7 @@ lazy_static = { default-features = false, version = "1.4.0" }
 libflate = { default-features = false, version = "2.0.0", features = ["std"] }
 log = { default-features = false, version = "0.4.19" }
 num-bigint = { default-features = false, version = "0.4.3" }
-regex = { default-features = false, version = "1.9.1", features = ["std", "perf"] }
+regex = { default-features = false, version = "1.9.3", features = ["std", "perf"] }
 serde = { default-features = false, version = "1.0.180", features = ["derive"] }
 serde_json = { default-features = false, version = "1.0.104", features = ["std"] }
 snap = { default-features = false, version = "1.1.0", optional = true }