Bump regex from 1.5.4 to 1.5.5 in /tools/copy_bom

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](https://github.com/rust-lang/regex/compare/1.5.4...1.5.5)

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

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

tools/copy_bom/Cargo.lock

@@ -333,9 +333,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.5.4"
+version = "1.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
 dependencies = [
  "aho-corasick",
  "memchr",

tools/copy_bom/Cargo.toml

@@ -13,7 +13,7 @@ env_logger = "0.9.0"
 sha2 = "0.9.5"
 data-encoding = "2.3.2"
 lazy_static = "1.4.0"
-regex = "1.5.4"
+regex = "1.5.5"
 shellexpand = "2.1"
 elf = "0.0.10"
 structopt = "0.3.23"