**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
"""Specifies the number of rows to fetch at a time with .fetchmany()"""
        self.buffersize = arraysize
    arraysize = property(get_arraysize, set_arraysize)
    def setinputsizes(self, sizes: Any) -> None:
        """Does nothing by default"""
    def setoutputsize(self, size: Any, column: Any = None) -> None:
        """Does nothing by default"""
def _bind_parameters(operation: str, parameters: Dict) -> str:
    """Helper method that binds parameters to a SQL query"""
    # 
    string_parameters = {}  # 
    for (name, value) in parameters.items():
        if value is None:
            string_parameters[name] = 'NULL'
        elif isinstance(value, str):
            string_parameters[name] = "'" + _escape(value) + "'"
        else:
            string_parameters[name] = str(value)
    return operation % string_parameters
def _escape(s: str) -> str:
    """Helper method that escapes parameters to a SQL query"""
    e = s
    e = e.replace('\\', '\\\\')
    e = e.replace('\n', '\\n')
    e = e.replace('\r', '\\r')
    e = e.replace("'", "\\'")
    e = e.replace('"', '\\"')
    return e
def _bq_cast(string_field: str, bq_type: str) -> Union[None, int, float, bool, str]: