Bump xmlsec from 1.3.15 to 1.3.16

Bumps [xmlsec](https://github.com/mehcode/python-xmlsec) from 1.3.15 to 1.3.16.
- [Release notes](https://github.com/mehcode/python-xmlsec/releases)
- [Commits](xmlsec/python-xmlsec@1.3.15...1.3.16)

---
updated-dependencies:
- dependency-name: xmlsec
  dependency-version: 1.3.16
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -37,4 +37,4 @@ SQLAlchemy==2.0.41
 typing_extensions==4.14.0
 urllib3==2.5.0
 Werkzeug==3.1.3
-xmlsec==1.3.15
+xmlsec==1.3.16