Bump yamllint from 1.25.0 to 1.26.0

Bumps yamllint from 1.25.0 to 1.26.0.

Changelog

Sourced from yamllint's changelog.

1.26.0 (2021-01-29)

• End support for Python 2 and Python 3.4, add support for Python 3.9
• Add forbid: non-empty option to braces and brackets rules
• Fix quoted-strings for explicit octal recognition
• Add documentation for integration with Arcanist
• Fix typos in changelog and README
• Stop using deprecated python setup.py test in tests

Commits

• 0fff4e2 yamllint version 1.26.0
• 1b378ed quoted-strings: Fix explicit octal recognition
• a3fc64d End support for Python 2
• ee4d163 Allow only non-empty brackets/braces
• 22335b2 Add support for Python 3.9, drop Python 3.4
• 0f9dffd docs: Add configuration for integration with Arcanist
• cef0b48 tests: Add unittest aliases to Python 2.7
• 11b1f1c tests: Fix indentation issues
• 9ee8c27 tests: Replace deprecated aliases
• 8eebab6 Fix typo in changelog
• Additional commits viewable in compare view