Bump the gradle group in /codegen with 2 updates (#644)

Author: dependabot[bot]

codegen/gradle/libs.versions.toml

@@ -5,7 +5,7 @@ mockito = "5.21.0"
 test-logger-plugin = "4.0.0"
 spotbugs = "6.0.22"
 spotless = "8.2.1"
-smithy-gradle-plugins = "1.3.0"
+smithy-gradle-plugins = "1.4.0"
 dep-analysis = "3.5.1"
 jsoup = "1.22.1"
 commonmark = "0.17.0"