build(deps): bump virtualenv from 20.0.16 to 20.0.26

[dependabot]

Bumps virtualenv from 20.0.16 to 20.0.26.

Changelog

Sourced from virtualenv's changelog.

v20.0.26 (2020-07-07)

Bugfixes - 20.0.26

- Bump dependency ``distutils >= 0.3.1`` - by :user:`gaborbernat`. (`[#1880](https://github.com/pypa/virtualenv/issues/1880) <https://github.com/pypa/virtualenv/issues/1880>`_)
- Improve periodic update handling:

better logging output while running and enable logging on background process call (
_VIRTUALENV_PERIODIC_UPDATE_INLINE may be used to debug behaviour inline)
fallback to unverified context when querying the PyPi for release date,
stop downloading wheels once we reach the embedded version,

by :user:gaborbernat. ([#1883](https://github.com/pypa/virtualenv/issues/1883) &lt;https://github.com/pypa/virtualenv/issues/1883&gt;_)

Do not print error message if the application exists with SystemExit(0) - by :user:gaborbernat. ([#1885](https://github.com/pypa/virtualenv/issues/1885) &lt;https://github.com/pypa/virtualenv/issues/1885&gt;_)
Upgrade embedded setuptools from 47.3.1 to 49.1.0 for Python 3.5+ - by :user:gaborbernat. ([#1887](https://github.com/pypa/virtualenv/issues/1887) &lt;https://github.com/pypa/virtualenv/issues/1887&gt;_)

v20.0.25 (2020-06-23)
Bugfixes - 20.0.25

• Fix that when the app-data seeders image creation fails the exception is silently ignored. Avoid two virtual environment creations to step on each others toes by using a lock while creating the base images. By :user:gaborbernat. ([#1869](https://github.com/pypa/virtualenv/issues/1869) <https://github.com/pypa/virtualenv/issues/1869>_)

v20.0.24 (2020-06-22)

Features - 20.0.24

- Ensure that the seeded packages do not get too much out of date:

add a CLI flag that triggers upgrade of embedded wheels under :option:upgrade-embed-wheels
periodically (once every 14 days) upgrade the embedded wheels in a background process, and use them if they have been
released for more than 28 days (can be disabled via :option:no-periodic-update)

More details under :ref:wheels - by :user:gaborbernat. ([#1821](https://github.com/pypa/virtualenv/issues/1821) <https://github.com/pypa/virtualenv/issues/1821>_)


Upgrade embed wheel content:

ship wheels for Python 3.9 and 3.10
upgrade setuptools for Python 3.5+ from 47.1.1 to 47.3.1

by :user:gaborbernat. ([#1841](https://github.com/pypa/virtualenv/issues/1841) <https://github.com/pypa/virtualenv/issues/1841>_)


Display the installed seed package versions in the final summary output, for example:
.. code-block:: console
created virtual environment CPython3.8.3.final.0-64 in 350ms
  creator CPython3Posix(dest=/x, clear=True, global=False)



</tr></table> ... (truncated)

Commits

• 6e0bbce release 20.0.26
• f354180 Improve periodic update handling (#1892)
• 23cf27f Fix test suite failing if run under system Python (#1888)
• 255a6d5 Fix homebrew python install (#1889)
• 260a26a Remove distlib monkeypatches (#1880)
• 12ad5cb Do not print error if exit with SystemExit (#1886)
• 69bed36 Upgrade embedded setuptools (#1887)
• 455afbc Skip pkg install (#1877)
• 02b197e Merge pull request #1871 from pypa/release-20.0.25
• 6e3fa99 release 20.0.25
• Additional commits viewable in compare view

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[jtrh]

@dependabot rebase