fix(deps): update dependency com.toasttab.android:gummy-bears-api-21 to v0.12.0 (#1947)

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

Author: renovate[bot]

disk-buffering/build.gradle.kts

@@ -20,7 +20,7 @@ dependencies {
   implementation("io.opentelemetry:opentelemetry-api-incubator")
   compileOnly("com.google.auto.value:auto-value-annotations")
   annotationProcessor("com.google.auto.value:auto-value")
-  signature("com.toasttab.android:gummy-bears-api-21:0.6.1:coreLib@signature")
+  signature("com.toasttab.android:gummy-bears-api-21:0.12.0:coreLib@signature")
   testImplementation("org.mockito:mockito-inline")
   testImplementation("io.opentelemetry:opentelemetry-sdk-testing")