Update matplotlib requirement from <3.8.0,>=3.0.0 to >=3.0.0,<3.9.0 in /_requirements

[dependabot[bot]]

Updates the requirements on matplotlib to permit the latest version.

Release notes

Sourced from matplotlib's releases.

REL: v3.8.0

Highlights of this release include:

• Type hints for most public APIs
• Many improvements to Mathtext
  • Addition of \boldsymbol command
  • Additional sizable delimiters
  • Documentation improvements
  • \substack command
  • \middle delimitier
  • \mathbfit for bold italic text
• 3D plotting improvements
  • Specify tick/axis label positions
  • Improved text for coordinates in interactive sessions
  • Ability to share view angles
• New plotting method ecdf (empirical cumulative distribution function)

Commits

• 3958242 REL: v3.8.0
• f1b13a7 Prepare for release v3.8.0
• b211d60 Merge pull request #26777 from meeseeksmachine/auto-backport-of-pr-26702-on-v...
• e0eb924 Merge pull request #26775 from meeseeksmachine/auto-backport-of-pr-26767-on-v...
• 0267cc1 Merge pull request #26776 from meeseeksmachine/auto-backport-of-pr-26687-on-v...
• f5d17a8 Backport PR #26702: converted coc to rst and put links in code_of_conduct.md
• 2c458cd Backport PR #26687: Remove usage of recarray
• 6ce6fe0 Backport PR #26767: Trim Gouraud triangles that contain NaN
• ec50ff3 Merge pull request #26770 from meeseeksmachine/auto-backport-of-pr-26762-on-v...
• 661c871 Backport PR #26762: MNT: Numpy 2.0 removals from ndarray class
• Additional commits viewable in compare view

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[dependabot[bot]]

Dependabot tried to add @Lightning-AI/core-lightning as a reviewer to this PR, but received the following error from GitHub:

POST https://api.github.com/repos/Lightning-AI/tutorials/pulls/273/requested_reviewers: 422 - Reviews may only be requested from collaborators. One or more of the teams you specified is not a collaborator of the Lightning-AI/tutorials repository. // See: https://docs.github.com/rest/pulls/review-requests#request-reviewers-for-a-pull-request

[codecov[bot]]

Codecov Report

Merging #273 (29e8561) into main (6a88174) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #273 +/- ## =================================== Coverage 73% 73% =================================== Files 2 2 Lines 382 382 =================================== Hits 280 280 Misses 102 102 ```