Bump workVersion from 2.6.0 to 2.7.1

Bumps `workVersion` from 2.6.0 to 2.7.1.

Updates `work-runtime` from 2.6.0 to 2.7.1

Updates `work-rxjava2` from 2.6.0 to 2.7.1

Updates `work-testing` from 2.6.0 to 2.7.1

---
updated-dependencies:
- dependency-name: androidx.work:work-runtime
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: androidx.work:work-rxjava2
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: androidx.work:work-testing
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

app/build.gradle

@@ -154,7 +154,7 @@ ext {
     parcelerVersion = "1.1.13"
     powermockVersion = "2.0.9"
     retrofit2Version = "2.9.0"
-    workVersion = "2.6.0"
+    workVersion = "2.7.1"
     markwonVersion = "4.6.2"
     espressoVersion = "3.4.0"
 }