**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/operators/bigquery.py
self,
        *,
        bucket: str,
        source_objects: List,
        destination_project_dataset_table: str,
        table_resource: Optional[Dict[str, Any]] = None,
        schema_fields: Optional[List] = None,
        schema_object: Optional[str] = None,
        source_format: str = 'CSV',
        compression: str = 'NONE',
        skip_leading_rows: int = 0,
        field_delimiter: str = ',',
        max_bad_records: int = 0,
        quote_character: Optional[str] = None,
        allow_quoted_newlines: bool = False,
        allow_jagged_rows: bool = False,
        bigquery_conn_id: str = 'google_cloud_default',
        google_cloud_storage_conn_id: str = 'google_cloud_default',
        delegate_to: Optional[str] = None,