chore(deps): Bump wiremock from 0.5.19 to 0.5.21 (#19055)

Bumps [wiremock](https://github.com/LukeMathWalker/wiremock-rs) from 0.5.19 to 0.5.21.
- [Changelog](https://github.com/LukeMathWalker/wiremock-rs/blob/main/CHANGELOG.md)
- [Commits](LukeMathWalker/wiremock-rs@v0.5.19...v0.5.21)

---
updated-dependencies:
- dependency-name: wiremock
  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>

Cargo.toml

@@ -364,7 +364,7 @@ tower-test = "0.4.0"
 vector-lib = { path = "lib/vector-lib", default-features = false, features = ["vrl", "test"] }
 vrl = { version = "0.8.1", features = ["cli", "test", "test_framework", "arbitrary"] }
 
-wiremock = "0.5.19"
+wiremock = "0.5.21"
 zstd = { version = "0.13.0", default-features = false }
 
 [patch.crates-io]