chore(deps): update dependency pl.allegro.tech.build.axion-release to v1.21.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-axionRelease = "1.18.18"
+axionRelease = "1.21.0"
 groovy = "3.0.24"
 rundeckCore = "5.14.0-rc1-20250722"
 nexusPublish = "2.0.0"