[fix] delete unused imports

Signed-off-by: Meret Behrens <meret.behrens@tngtech.com>

Author: Meret Behrens

src/spdx/parser/jsonlikedict/json_like_dict_parser.py

@@ -8,7 +8,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-import json
 from typing import Dict
 
 from spdx.model.document import Document

src/spdx/validation/creation_info_validator.py

@@ -9,7 +9,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import re
 from typing import List
 
 from spdx.model.document import CreationInfo

tests/parser/jsonlikedict/test_dict_parsing_functions.py

@@ -8,7 +8,6 @@
 #  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
-from datetime import datetime
 from unittest import TestCase
 
 import pytest
@@ -18,7 +17,6 @@
 from spdx.parser.error import SPDXParsingError
 from spdx.parser.jsonlikedict.dict_parsing_functions import json_str_to_enum_name, \
     parse_field_or_no_assertion, parse_field_or_no_assertion_or_none
-from spdx.datetime_conversions import datetime_from_str
 
 
 def test_json_str_to_enum():