build(deps): update lxml requirement from ~=4.9.1 to ~=5.1.0

Updates the requirements on [lxml](https://github.com/lxml/lxml) to permit the latest version.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.9.1...lxml-5.1.0)

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

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

docs/requirements.txt

@@ -1,6 +1,6 @@
 sphinx-autodoc-typehints~=1.19.5
 loguru~=0.6.0
-lxml~=4.9.1
+lxml~=5.1.0
 pymediainfo~=6.0.1
 requests~=2.28.1
 langcodes~=3.3.0

requirements.txt

@@ -1,7 +1,7 @@
 langcodes~=3.3.0
 language-data~=1.1
 loguru~=0.6.0
-lxml~=4.9.1
+lxml~=5.1.0
 numpy~=1.23.5
 psutil~=5.9.4
 pymediainfo~=6.0.1