Update reactor to v3.7.7 (#238)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotlin = "2.1.21"
 jackson = "2.19.1"
-reactor = "3.7.6"
+reactor = "3.7.7"
 mockito = "5.18.0"
 
 [libraries]