Bump beautifulsoup4 from 4.14.3 to 4.15.0 in /pelican

Bumps [beautifulsoup4](https://www.crummy.com/software/BeautifulSoup/bs4/) from 4.14.3 to 4.15.0.

---
updated-dependencies:
- dependency-name: beautifulsoup4
  dependency-version: 4.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pelican/pyproject.toml

@@ -49,7 +49,7 @@ classifiers = [
 dependencies = [
     "markdown>=3.10.2,<4.0",
     "pelican-sitemap>=1.2.2,<2.0",
-    "beautifulsoup4>=4.14.3,<5.0",
+    "beautifulsoup4>=4.15.0,<5.0",
     "ezt>=1.1,<2.0",
     "PyYAML>=6.0.3,<7.0",
     "requests>=2.34.2,<3.0",