chore(deps): Bump signxml from 3.2.2 to 4.0.2

Bumps [signxml](https://github.com/kislyuk/signxml) from 3.2.2 to 4.0.2.
- [Release notes](https://github.com/kislyuk/signxml/releases)
- [Changelog](https://github.com/XML-Security/signxml/blob/develop/Changes.rst)
- [Commits](XML-Security/signxml@v3.2.2...v4.0.2)

---
updated-dependencies:
- dependency-name: signxml
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.in

@@ -18,4 +18,4 @@ marshmallow==3.22.0
 pydantic==2.9.2
 pyOpenSSL==24.2.1
 pytz==2024.1
-signxml==3.2.2
+signxml==4.0.2

requirements.txt

@@ -64,9 +64,7 @@ pydantic==2.9.2
 pydantic-core==2.23.4
     # via pydantic
 pyopenssl==24.2.1
-    # via
-    #   -r requirements.in
-    #   signxml
+    # via -r requirements.in
 pytz==2024.1
     # via -r requirements.in
 referencing==0.35.1
@@ -77,7 +75,7 @@ rpds-py==0.19.0
     # via
     #   jsonschema
     #   referencing
-signxml==3.2.2
+signxml==4.0.2
     # via -r requirements.in
 sqlparse==0.5.0
     # via django