Bump regex from 1.4.3 to 1.4.6

Bumps [regex](https://github.com/rust-lang/regex) from 1.4.3 to 1.4.6.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.4.3...1.4.6)

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

Author: dependabot[bot]

Cargo.lock

@@ -22,7 +22,7 @@ aoc-runner-derive = "0.3.0"
 itertools = "0.10.0"
 lazy_static = "1.4.0"
 lexical = "5.2.0"
-regex = "1.4.3"
+regex = "1.4.6"
 regex-macro = "0.1.1"
 ring-algorithm = "0.2.3"
 serde_scan = "0.4.1"