fix(deps): update dependency io.micronaut:micronaut-core-bom to v4.8.13 (#752)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-micronaut = "4.8.12"
+micronaut = "4.8.13"
 micronaut-test = "4.7.0"
 micronaut-logging = "1.6.1"
 micronaut-platform = "4.2.3"