sagemathgh-38577: Add various project URLs for PyPI

    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->

The changed file, `m4/pyproject_toml_metadata.m4`, controls the metadata
of the modularized distributions.

The same changes should be done to **sagemath-standard** and **sage-
conf** after sagemath#37902, sagemath#36561 are merged.

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->
    
URL: sagemath#38577
Reported by: Matthias Köppe
Reviewer(s): Kwankyu Lee, Matthias Köppe

m4/pyproject_toml_metadata.m4

@@ -17,5 +17,10 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: Scientific/Engineering :: Mathematics",
 ]
-urls = {Homepage = "https://www.sagemath.org"}
+urls = {download = "https://doc.sagemath.org/html/en/installation/index.html",
+        "release notes" = "https://github.com/sagemath/sage/releases",
+        source = "https://github.com/sagemath/sage",
+        documentation = "https://doc.sagemath.org",
+        homepage = "https://www.sagemath.org",
+        tracker = "https://github.com/sagemath/sage/issues"}
 requires-python = ">=3.9, <3.13"