Bump jersey_version from 2.25.1 to 2.28

Bumps `jersey_version` from 2.25.1 to 2.28.

Updates `jersey-client` from 2.25.1 to 2.28

Updates `jersey-media-multipart` from 2.25.1 to 2.28

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

Author: dependabot-support

external-dependencies.gradle

@@ -1,7 +1,7 @@
 ext {
     dropwizard_version = '1.3.9'
     dropwizard_metrics_version = '4.0.5'
-    jersey_version = '2.25.1'
+    jersey_version = '2.28'
     jackson_version = '2.9.8'
     jetty_version = '9.4.15.v20190215'