Bump commons-io:commons-io from 2.20.0 to 2.21.0

Bumps [commons-io:commons-io](https://github.com/apache/commons-io) from 2.20.0 to 2.21.0.
- [Changelog](https://github.com/apache/commons-io/blob/master/RELEASE-NOTES.txt)
- [Commits](apache/commons-io@rel/commons-io-2.20.0...rel/commons-io-2.21.0)

---
updated-dependencies:
- dependency-name: commons-io:commons-io
  dependency-version: 2.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ embulk-util-file = "0.2.0"
 
 commons-compress = "1.28.0"
 commons-codec = "1.19.0"
-commons-io = "2.20.0"
+commons-io = "2.21.0"
 commons-lang3 = "3.18.0"
 
 checkstyle = "9.3"