feat(Dependencies): Update dependency iso8601 to v2.1.0

| datasource | package | from  | to    |
| ---------- | ------- | ----- | ----- |
| pypi       | iso8601 | 2.0.0 | 2.1.0 |

requirements.txt

@@ -18,7 +18,7 @@ dogpile.cache==1.2.2; python_version >= '3.6'
 humanize==4.8.0; python_version >= '3.7'
 idna==3.4; python_version >= '3'
 importlib-metadata==6.8.0; python_version < '3.8'
-iso8601==2.0.0; python_version < '4' and python_full_version >= '3.6.2'
+iso8601==2.1.0; python_version < '4' and python_full_version >= '3.6.2'
 jmespath==1.0.1; python_version >= '3.7'
 jsonpatch==1.33; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'
 jsonpointer==2.4; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'