Bump regex from 1.5.4 to 1.5.5 in /ruby

Bumps [regex](https://github.com/rust-lang/regex) from 1.5.4 to 1.5.5.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.5.4...1.5.5)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ruby/Cargo.lock

@@ -17,4 +17,4 @@ tracing = "0.1"
 tracing-subscriber = { version = "0.3.3", features = ["env-filter"] }
 rayon = "1.5.0"
 num_cpus = "1.13.0"
-regex = "1.4.3"
+regex = "1.5.5"