Update gson (2.9.0 -> 2.9.1)

Author: nstdio

buildSrc/src/main/kotlin/io.github.nstdio.http.ext.test-conventions.gradle.kts

@@ -79,7 +79,7 @@ val slf4jVersion = "1.7.36"
 val jacksonVersion = "2.13.4"
 val brotli4JVersion = "1.8.0"
 val brotliOrgVersion = "0.1.2"
-val gsonVersion = "2.9.0"
+val gsonVersion = "2.9.1"
 val equalsverifierVersion = "3.10.1"
 
 val jsonLibs = mapOf(