chore(deps): update dependency apache-beam to v2.28.0 (#219)

Author: renovate-bot

packages/google-cloud-bigtable/samples/beam/requirements.txt

@@ -1,3 +1,3 @@
-apache-beam==2.27.0
+apache-beam==2.28.0
 google-cloud-bigtable<2.0.0dev1
 google-cloud-core==1.6.0