Bump regex from 1.5.4 to 1.5.5 (#756)

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
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

Cargo.lock

@@ -12,7 +12,7 @@ bytes = { version = "1.0.1", features = [ "serde" ] }
 chrono = { version = "0.4.19", features = [ "serde" ] }
 dropshot = { git = "https://github.com/oxidecomputer/dropshot", branch = "main" }
 oximeter = { path = "../oximeter" }
-regex = "1.5.4"
+regex = "1.5.5"
 reqwest = { version = "0.11.8", features = [ "json" ] }
 schemars = { version = "0.8.8", features = [ "uuid", "bytes", "chrono" ] }
 serde = { version = "1", features = [ "derive" ] }