fix(deps): update dependency io.micronaut.build.shared.settings:io.micronaut.build.shared.settings.gradle.plugin to v8.0.0-m8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -45,7 +45,7 @@ micronaut-session = "4.8.0"
 micronaut-grpc = "4.12.0"
 micronaut-spring = "5.12.0"
 micronaut-docs = "3.0.0"
-micronaut-shared-settings = "8.0.0-M6"
+micronaut-shared-settings = "8.0.0-M8"
 
 # javascript libraries
 js-swagger-ui = "5.29.3"