fix(deps): update dependency io.micronaut.r2dbc:micronaut-r2dbc-bom to v6

Author: renovate[bot]

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ micronaut-testresources = "2.7.3"
 micronaut-azure = "5.9.0"
 micronaut-reactor = "3.7.0"
 micronaut-rxjava2 = "2.7.0"
-micronaut-r2dbc = "5.7.0"
+micronaut-r2dbc = "6.0.0"
 micronaut-sql = "6.1.1"
 micronaut-serde = "2.14.0"
 micronaut-spring = "5.10.0"