[develop]: Update requests and certifi in requirements.txt

[gspetro-NOAA]

DESCRIPTION OF CHANGES:

The Dependabot PR #1101 identified the need to update the certifi version, but requests should also be updated from the current (yanked) version in the requirements file.

Type of change

• This change requires a documentation update

TESTS CONDUCTED:

None required. Generated the requirements file locally with the proposed upgrade to certifi and then resolved warnings generated by the requests version. With these two updates, the requirements.txt file can be generated without warnings or errors.

DEPENDENCIES:

None.

DOCUMENTATION:

All documentation.

ISSUE:

Fixes issue identified in Dependabot PR #1101

CHECKLIST

• My code follows the style guidelines in the Contributor's Guide
• I have performed a self-review of my own code using the Code Reviewer's Guide
• I have commented my code, particularly in hard-to-understand areas (N/A)
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes do not require updates to the documentation (explain). (N/A)
• My changes generate no new warnings
• New and existing tests pass with my changes (N/A)
• Any dependent changes have been merged and published (N/A)

[MichaelLueken]

Thanks for going through and updating the versions of both certifi and requests, @gspetro-NOAA! Since you updated the "yanked" version of requests as well, I think I would prefer to get this PR in, then close PR #1101.

[natalie-perlin]

Could the ./ufs-srweather-app/doc/README be updates as well in this PR?

When sphinx, sphinx-rtd-theme have been installed (not going into the details of installations), the way to build the html documentaion requires the following:

$ cd ufs-srweather-app/doc
$ cp conf.py UsersGuide/.
$ make clean && sphinx-build -b html UsersGuide/ build

The above three lines would replace lines 23-24 in the current README
https://github.com/ufs-community/ufs-srweather-app/blob/develop/doc/README

[gspetro-NOAA]

@natalie-perlin I updated the doc README (and the regular README), but I used a two-line update rather than what you suggested. There should be no need to copy the conf.py file anywhere.

[MichaelLueken]

Thank you for updating the README files as well, @gspetro-NOAA! Moving forward with merging this work now.