chore(deps): update dependency google-api-core to v2.1.0 (GoogleCloudPlatform#6800)

Co-authored-by: gcf-merge-on-green[bot] <60162190+gcf-merge-on-green[bot]@users.noreply.github.com>

Author: renovate-bot

monitoring/opencensus/requirements.txt

@@ -1,7 +1,7 @@
 Flask==2.0.1
 # Update this to a >2 once opencensus allows newer versions:
 # https://github.com/census-instrumentation/opencensus-python/pull/1066
-google-api-core==1.31.3
+google-api-core==2.1.0
 google-auth==1.35.0
 googleapis-common-protos==1.53.0
 opencensus==0.8.0

monitoring/prometheus/requirements.txt

@@ -1,5 +1,5 @@
 Flask==2.0.1
-google-api-core==2.0.0
+google-api-core==2.1.0
 google-auth==2.0.0
 googleapis-common-protos==1.53.0
 prometheus-client==0.11.0