build(deps): bump zmij from 1.0.19 to 1.0.21 (#4474)

Bumps [zmij](https://github.com/dtolnay/zmij) from 1.0.19 to 1.0.21.
- [Release notes](https://github.com/dtolnay/zmij/releases)
- [Commits](dtolnay/zmij@1.0.19...1.0.21)

---
updated-dependencies:
- dependency-name: zmij
  dependency-version: 1.0.21
  dependency-type: indirect
  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>

Author: dependabot[bot]

Cargo.lock

@@ -4778,6 +4778,6 @@ dependencies = [
 
 [[package]]
 name = "zmij"
-version = "1.0.19"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ff05f8caa9038894637571ae6b9e29466c1f4f829d26c9b28f869a29cbe3445"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"