Bump io.spring.security.release from 1.0.6 to 1.0.8

Bumps [io.spring.security.release](https://github.com/spring-io/spring-security-release-tools) from 1.0.6 to 1.0.8.
- [Release notes](https://github.com/spring-io/spring-security-release-tools/releases)
- [Commits](https://github.com/spring-io/spring-security-release-tools/compare/v1.0.6...v1.0.8)

---
updated-dependencies:
- dependency-name: io.spring.security.release
  dependency-version: 1.0.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -1,6 +1,6 @@
 plugins {
 	id "io.spring.convention.root"
-	id "io.spring.security.release" version "1.0.6"
+	id "io.spring.security.release" version "1.0.8"
 }
 
 group = "org.springframework.security"