chore(deps): update dependency google-api-core to v2.26.0

Author: renovate-bot

samples/snippets/requirements.txt

@@ -3,7 +3,7 @@ certifi==2025.10.5
 charset-normalizer==3.4.3
 geoalchemy2===0.17.1; python_version == '3.9'
 geoalchemy2==0.18.0; python_version >= '3.10'
-google-api-core[grpc]==2.25.2
+google-api-core[grpc]==2.26.0
 google-auth==2.41.1
 google-cloud-bigquery==3.38.0; python_version >= '3.9'
 google-cloud-core==2.4.3