Update dependency pl.allegro.tech.build.axion-release to v1.21.1

Author: renovate[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 nexusPublish = "2.0.0"
 freemarker = "2.3.34"
 rundeckCore = "6.0.0-alpha1-20260407"
-axionRelease = "1.18.16"
+axionRelease = "1.21.1"
 # Security overrides for transitive dependencies
 commonsLang3 = "3.20.0"