build(deps): bump pl.allegro.tech.build.axion-release (#60)

Bumps [pl.allegro.tech.build.axion-release](https://github.com/allegro/axion-release-plugin) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/allegro/axion-release-plugin/releases)
- [Commits](allegro/axion-release-plugin@v1.20.1...v1.21.0)

---
updated-dependencies:
- dependency-name: pl.allegro.tech.build.axion-release
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id "org.sonarqube" version "6.3.1.5724"
-    id "pl.allegro.tech.build.axion-release" version "1.20.1"
+    id "pl.allegro.tech.build.axion-release" version "1.21.0"
 }
 
 scmVersion {