[#1457] Update dependency com.codingfeline.buildkonfig to v0.21.0

Co-authored-by: Mustafa Ozhan <mr.mustafa.ozhan@gmail.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -34,7 +34,7 @@ leakCanary = "2.14"
 sqlDelight = "1.5.5"
 lifecycle = "2.10.0"
 mokoResources = "0.26.4"
-buildKonfig = "0.18.0"
+buildKonfig = "0.21.0"
 splashScreen = "1.2.0"
 kover = "0.9.8"
 rootBeer = "0.1.2"