Bump workVersion from 2.3.0 to 2.5.0

Bumps `workVersion` from 2.3.0 to 2.5.0.

Updates `work-runtime` from 2.3.0 to 2.5.0

Updates `work-rxjava2` from 2.3.0 to 2.5.0

Updates `work-testing` from 2.3.0 to 2.5.0

Signed-off-by: dependabot[bot] <support@github.com>

app/build.gradle

@@ -159,7 +159,7 @@ ext {
     parcelerVersion = "1.1.13"
     powermockVersion = "2.0.9"
     retrofit2Version = "2.7.1"
-    workVersion = "2.3.0"
+    workVersion = "2.5.0"
     markwonVersion =  "4.6.2"
 }