chore(deps): Update dependency google-cloud-bigquery to v3.21.0 (#202)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

examples/logs-slack-alerts/function_source/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-bigquery==3.20.1
+google-cloud-bigquery==3.21.0
 requests==2.31.0