chore(deps): update dependency apache-beam to v2.39.0 (#592)

Author: renovate-bot

samples/beam/requirements.txt

@@ -1,3 +1,3 @@
-apache-beam==2.38.0
+apache-beam==2.39.0
 google-cloud-bigtable==2.9.0
 google-cloud-core==2.3.0