Update dependency google-api-core to v1.31.5

Author: renovate-bot

requirements.txt

@@ -3,7 +3,7 @@ certifi==2020.12.5; python_version >= "2.7" and python_full_version < "3.0.0" or
 cffi==1.14.5; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
 chardet==4.0.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.6.0"
 colorama==0.4.4; python_version >= "3.5" and python_full_version < "3.0.0" and sys_platform == "win32" or sys_platform == "win32" and python_version >= "3.5" and python_full_version >= "3.5.0"
-google-api-core==1.26.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
+google-api-core==1.31.5; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
 google-auth==1.26.1; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"
 google-cloud-bigquery==2.6.1; python_version >= "3.6"
 google-cloud-core==1.6.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.6"