Bump xml2rfc from 3.12.0 to 3.12.4

Bumps [xml2rfc](https://github.com/ietf-tools/xml2rfc) from 3.12.0 to 3.12.4.
- [Release notes](https://github.com/ietf-tools/xml2rfc/releases)
- [Changelog](https://github.com/ietf-tools/xml2rfc/blob/main/CHANGELOG.md)
- [Commits](ietf-tools/xml2rfc@cli/3.12.0...v3.12.4)

---
updated-dependencies:
- dependency-name: xml2rfc
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -26,8 +26,10 @@ kitchen==1.2.6
     # via xml2rfc
 lxml==4.9.1
     # via xml2rfc
-markupsafe==2.1.1
-    # via jinja2
+markupsafe==2.0.1
+    # via
+    #   jinja2
+    #   xml2rfc
 pycountry==22.3.5
     # via xml2rfc
 pyflakes==2.4.0
@@ -48,7 +50,7 @@ urllib3==1.26.10
     # via requests
 webencodings==0.5.1
     # via html5lib
-xml2rfc==3.12.0
+xml2rfc==3.12.4
     # via -r requirements.in
 
 # The following packages are considered to be unsafe in a requirements file: