Add flake8-deprecated recipe

[traversaro]

This PR adds the grayskull-generated recipe for the flake8-deprecated Python package.

PyPI page: https://pypi.org/project/flake8-deprecated/
GitHub repo: https://github.com/gforcada/flake8-deprecated
Repology version (that shows that is already packaged in Debian and Fedora): https://repology.org/project/python:flake8-deprecated/versions

Checklist

• Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• License file is packaged (see here for an example).
• Source is from official source.
• Package does not vendor other packages. (If a package uses the source of another package, they should be separate packages or the licenses of all packages need to be packaged).
• If static libraries are linked in, the license of the static library is packaged.
• Package does not ship static libraries. If static libraries are needed, follow CFEP-18.
• Build number is 0.
• A tarball (url) rather than a repo (e.g. git_url) is used in your recipe (see here for more details).
• GitHub users listed in the maintainer section have posted a comment confirming they are willing to be listed there.
• When in trouble, please check our knowledge base documentation before pinging a team.

[github-actions]

Hi! This is the staged-recipes linter and your PR looks excellent! 🚀

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/flake8-deprecated/meta.yaml) and found some lint.

Here's what I've got...

For recipes/flake8-deprecated/meta.yaml:

• The home item is expected in the about section.

For recipes/flake8-deprecated/meta.yaml:

• License is not an SPDX identifier (or a custom LicenseRef) nor an SPDX license expression.

Documentation on acceptable licenses can be found here.

[traversaro]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/flake8-deprecated/meta.yaml) and found some lint.

Here's what I've got...

For recipes/flake8-deprecated/meta.yaml:

* The home item is expected in the about section.

For recipes/flake8-deprecated/meta.yaml:

* License is not an SPDX identifier (or a custom LicenseRef) nor an SPDX license expression.

Documentation on acceptable licenses can be found here.

Addressed in fdee0d8 .

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/flake8-deprecated/meta.yaml) and found it was in an excellent condition.

[traversaro]

@conda-forge/help-python @conda-forge/staged-recipes the PR is ready for review, thanks!

[github-actions]

To help direct your pull request to the best reviewers, please mention a topic-specifc team if your recipe matches any of the following: conda-forge/help-c-cpp, conda-forge/help-cdts, conda-forge/help-go, conda-forge/help-java, conda-forge/help-julia, conda-forge/help-nodejs, conda-forge/help-perl, conda-forge/help-python, conda-forge/help-python-c, conda-forge/help-r, conda-forge/help-ruby,or conda-forge/help-rust. Thanks!