fix(deps): update kotlinx to v1.7.3 (#175)

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

Author: renovate[bot]

gradle/libs-test.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-kotlinx = "1.7.2"
+kotlinx = "1.7.3"
 spring-boot = "2.7.14"
 spring-kafka = "2.9.10"
 junit = "5.10.0"

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 kotlin = "1.9.0"
-kotlinx = "1.7.2"
+kotlinx = "1.7.3"
 spring-boot = "2.7.14"
 spring-dependency-management = "1.1.2"
 spring-framework = "5.3.29"