Update dependency org.junit:junit-bom to v6.0.3 (#427)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 doma = "3.11.1"
-junit = "6.0.2"
+junit = "6.0.3"
 
 [libraries]
 doma-core = { module = "org.seasar.doma:doma-core", version.ref = "doma" }