fix(deps): update dependency com.uber.nullaway:nullaway to v0.12.6 (#913)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -63,7 +63,7 @@ okhttp-mockwebserver = { module = "com.squareup.okhttp3:mockwebserver", version.
 
 #Compilation tools
 desugarJdkLibs = "com.android.tools:desugar_jdk_libs:2.1.5"
-nullaway = "com.uber.nullaway:nullaway:0.12.5"
+nullaway = "com.uber.nullaway:nullaway:0.12.6"
 errorprone-core = "com.google.errorprone:error_prone_core:2.37.0"
 errorprone-javac = "com.google.errorprone:javac:9+181-r4173-1"
 spotless-plugin = { module = "com.diffplug.spotless:spotless-plugin-gradle", version.ref = "spotless" }