Update the compatible micronaut version

Author: seratch

docs/_config.yml

@@ -11,7 +11,6 @@ okhttpVersion: 4.9.3
 slf4jApiVersion: 1.7.32
 kotlinVersion: 1.6.0
 springBootVersion: 2.6.1
-# TODO: 3.x when releasing bolt-micronaut 1.16
-compatibleMicronautVersion: 2.x
+compatibleMicronautVersion: 3.x
 quarkusVersion: 1.9.2.Final
 helidonVersion: 2.3.2