Update dependency commons-io:commons-io to v2.21.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ asnOne = "0.6.0"
 eddsa = "0.3.0"
 bouncycastle = "1.80"
 expectit = "0.9.0"
-commonsIo = "2.17.0"
+commonsIo = "2.21.0"
 rundeckCore = "5.16.0-20251006"
 slf4j = "2.0.17"
 junit = "4.13.2"