Bump pyicu from 2.12 to 2.15

Bumps [pyicu](https://gitlab.pyicu.org/main/pyicu) from 2.12 to 2.15.

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

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

Author: dependabot[bot]

requirements.txt

@@ -6,7 +6,7 @@ followthemoney-store[postgresql]==3.1.0
 servicelayer[google,amazon]==1.24.0
 languagecodes==1.1.1
 countrytagger==0.1.2
-pyicu==2.12
+pyicu==2.15
 google-cloud-vision==3.10.1
 tesserocr==2.8.0
 spacy==3.8.5 # pinned because spacy 3.8 requires numpy >2 which breaks fasttext (see https://groups.google.com/g/fasttext-library/c/4EOM0-S6xHU)