**Apache Airflow version**: 1.10.*
**BackPort Packages version**: 2020.10.5rc1

**What happened**:

`BigQueryInsertJobOperator` tries to start a BigQuery job by specifying a job_id which is a combination of `dag_id`, `task_id`, `execution_date` and an additional `uniqueness_suffix`.

https://github.com/apache/airflow/blob/master/airflow/providers/google/cloud/operators/bigquery.py#L2072

However, because BigQuery only accepts alphanumeric (in additon to dashes and underscore) characters then, if a DagID contains a version number whcih includes a `.` character then this will cause the task to fail.

https://cloud.google.com/bigquery/docs/running-jobs#generate-jobid

**How to reproduce it**:
Create a DAG with the name `my-dag-v1.0`.
airflow/providers/google/cloud/hooks/bigquery.py
"""
        Execute a BigQuery query multiple times with different parameters.
        :param operation: The query to execute.
        :type operation: str
        :param seq_of_parameters: List of dictionary parameters to substitute into the
            query.
        :type seq_of_parameters: list
        """
        for parameters in seq_of_parameters:
            self.execute(operation, parameters)
    def flush_results(self) -> None:
        """Flush results related cursor attributes"""
        self.page_token = None
        self.job_id = None
        self.all_pages_loaded = False
        self.buffer = []
    def fetchone(self) -> Union[List, None]:
        """Fetch the next row of a query result set"""
        # 
        return self.next()
    def next(self) -> Union[List, None]: