Bump lxml from 4.6.3 to 4.6.5 in /build/ci-cd/python (#1096)

Bumps [lxml](https://github.com/lxml/lxml) from 4.6.3 to 4.6.5.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-4.6.3...lxml-4.6.5)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build/ci-cd/python/requirements.txt

@@ -1,3 +1,3 @@
-lxml==4.6.3
+lxml==4.6.5
 ruamel.yaml==0.17.10
 ruamel.yaml.clib==0.2.6