build(deps): update sphinx requirement from ~=7.2.2 to ~=7.3

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.2.2...v7.3.7)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -46,7 +46,7 @@ dev = [
     "types-tqdm~=4.66.0",
     "types-tabulate~=0.9.0",
 ]
-docs = ["pydata-sphinx-theme~=0.13", "sphinx~=7.2.2", "sphinx-click~=5.0"]
+docs = ["pydata-sphinx-theme~=0.13", "sphinx~=7.3", "sphinx-click~=5.0"]
 
 [project.scripts]
 stac-asset = "stac_asset._cli:cli"