py-requests: updated to 2.26.0

2.26.0 (2021-07-13)
-------------------

**Improvements**

- Requests now supports Brotli compression, if either the `brotli` or
  `brotlicffi` package is installed.

- `Session.send` now correctly resolves proxy configurations from both
  the Session and Request. Behavior now matches `Session.request`.

**Bugfixes**

- Fixed a race condition in zip extraction when using Requests in parallel
  from zip archive.

**Dependencies**

- Instead of `chardet`, use the MIT-licensed `charset_normalizer` for Python3
  to remove license ambiguity for projects bundling requests. If `chardet`
  is already installed on your machine it will be used instead of `charset_normalizer`
  to keep backwards compatibility.

  You can also install `chardet` while installing requests by
  specifying `[use_chardet_on_py3]` extra as follows:

    ```shell
    pip install "requests[use_chardet_on_py3]"
    ```

  Python2 still depends upon the `chardet` module.

- Requests now supports `idna` 3.x on Python 3. `idna` 2.x will continue to
  be used on Python 2 installations.

**Deprecations**

- The `requests[security]` extra has been converted to a no-op install.
  PyOpenSSL is no longer the recommended secure option for Requests.

- Requests has officially dropped support for Python 3.5.

(adam)