Bump buildpacks/gradle/test-apps/heroku-gradle-getting-started from `50c6269` to `b2ba866` #867

Job	Run time
Integration Tests (buildpacks/gradle, builder:24, amd64)	2m 38s
Integration Tests (buildpacks/jvm, builder:24, amd64)	1m 47s
Integration Tests (buildpacks/maven, builder:24, amd64)	2m 54s
Integration Tests (buildpacks/sbt, builder:24, amd64)	4m 48s
Integration Tests (buildpacks/gradle, builder:24, arm64)	3m 22s
Integration Tests (buildpacks/jvm, builder:24, arm64)	1m 19s
Integration Tests (buildpacks/maven, builder:24, arm64)	3m 14s
Integration Tests (buildpacks/sbt, builder:24, arm64)	4m 31s
Integration Tests (buildpacks/gradle, builder:22, amd64)	2m 47s
Integration Tests (buildpacks/jvm, builder:22, amd64)	1m 38s
Integration Tests (buildpacks/jvm-function-invoker, builder:22, amd64)	2m 14s
Integration Tests (buildpacks/maven, builder:22, amd64)	3m 15s
Integration Tests (buildpacks/sbt, builder:22, amd64)	5m 3s
Integration Tests (buildpacks/gradle, builder:20, amd64)	2m 49s
Integration Tests (buildpacks/jvm, builder:20, amd64)	1m 34s
Integration Tests (buildpacks/maven, builder:20, amd64)	3m 2s
Integration Tests (buildpacks/sbt, builder:20, amd64)	4m 54s
Rust Code Linting	15s
Unit Tests	27s
	52m 31s

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