build: bump micronaut-gradle-plugins from 2.0.14 to 2.0.15 (#308)

Bumps micronaut-gradle-plugins from 2.0.14 to 2.0.15.

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

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

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         maven { url "https://repo.grails.org/grails/core" }
     }
     dependencies {
-        classpath "io.micronaut.build:micronaut-gradle-plugins:2.0.14"
+        classpath "io.micronaut.build:micronaut-gradle-plugins:2.0.15"
     }
 }