Update base classes used in bigquery_check_operator to renamed versions

[dewaldabrie]

airflow.contrib.operators.bigquery_check_operator.BigQueryValueCheckOperator is derived from airflow.operators.check_operator.ValueCheckOperator but needs to be derived from airflow.operators.sql.SQLValueCheckOperator instead.

Until this is done, airflow generates a lot of warnings from this line of code.

Fixes #10271

[boring-cyborg]

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[mik-laj]

@dewaldabrie Can you look here? #10271

[dewaldabrie]

@mik-laj Thanks, I replied there. Not sure why the checks in the CI is failing since it seems related to things I didn't touch like Add license for all SQL files.

[potiuk]

We have a bug in the CI cache specification. I am going to fix it shortly

[potiuk]

SHould be fixed now by #10299. I also cherry-picked it to 1-10-stable and 1-10-test. Can you please rebase again on top of the latest v1-10-stable and it should be fixed permanently now.

[potiuk]

Hey @dewaldabrie - if you want this one to be part of 1.10.12 (willl be released very shortly) you should rebase this one

[boring-cyborg]

Awesome work, congrats on your first merged pull request!