Update dependency io.reactivex.rxjava3:rxjava to v3.1.6 (#3353)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -43,7 +43,7 @@ okhttp = "4.10.0"
 retrofit = "2.9.0"
 robolectric = "4.8.1"
 rxandroid3 = "3.0.0"
-rxjava3 = "3.1.3"
+rxjava3 = "3.1.6"
 rxkotlin3 = "3.0.1"
 photoview = "2.3.0"
 sparkbutton = "4.1.0"