chore(deps): update dependency apache-beam to v2.70.0

Author: renovate-bot

samples/beam/requirements.txt

@@ -1,4 +1,4 @@
 apache-beam===2.60.0; python_version == '3.8'
-apache-beam==2.69.0; python_version >= '3.9'
+apache-beam==2.70.0; python_version >= '3.9'
 google-cloud-bigtable==2.34.0
 google-cloud-core==2.5.0