change: allow urllib3 1.26

[metrizable]

Issue #, if available:

Description of changes:

changes include:

• remove <1.26 constraint for urllib3
• fix 1.25 mask as 1.25.0 is an incorrect version string for the yanked package version

Testing done:

unit:

❯ tox --parallel 3 -- -rfE --disable-warnings tests/unit
✔ OK black-format in 12.772 seconds
✔ OK flake8 in 35.539 seconds
✔ OK pylint in 51.615 seconds
✔ OK docstyle in 47.626 seconds
✔ OK doc8 in 45.103 seconds
✔ OK twine in 39.955 seconds
✔ OK sphinx in 3 minutes, 20.818 seconds
✔ OK py36 in 9 minutes, 18.663 seconds
✔ OK py37 in 9 minutes, 22.313 seconds
✔ OK py38 in 8 minutes, 15.784 seconds

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