Bump dev.zio:zio_3 from 2.1.20 to 2.1.21

Bumps [dev.zio:zio_3](https://github.com/zio/zio) from 2.1.20 to 2.1.21.
- [Release notes](https://github.com/zio/zio/releases)
- [Commits](zio/zio@v2.1.20...v2.1.21)

---
updated-dependencies:
- dependency-name: dev.zio:zio_3
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -19,7 +19,7 @@ def VERSIONS = [
     SCALA3        : "3.7.2",
     MAGNUM        : "1.3.1",
     STTP          : "3.11.0",
-    ZIO           : "2.1.20",
+    ZIO           : "2.1.21",
     REST_ASSURED  : "5.5.6",
 ]