build(deps): bump pyicu from 2.12 to 2.13

---
updated-dependencies:
- dependency-name: pyicu
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -2,5 +2,5 @@
 # as soon as they get released by pinning them here and
 # letting `dependabot` update them for new releases.
 lxml==5.2.1
-PyICU==2.12 
+PyICU==2.13 
 html5lib==1.1