Update phonenumbers requirement from ~=8.12.54 to ~=8.12.55 (#111)

Updates the requirements on [phonenumbers](https://github.com/daviddrysdale/python-phonenumbers) to permit the latest version.
- [Release notes](https://github.com/daviddrysdale/python-phonenumbers/releases)
- [Commits](daviddrysdale/python-phonenumbers@v8.12.54...v8.12.55)

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

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requirements.txt

@@ -1,6 +1,6 @@
 ftfy ~= 6.0.0
 mailchecker ~= 5.0.0
-phonenumbers ~= 8.12.54
+phonenumbers ~= 8.12.55
 python-dateutil ~= 2.8.2
 python-fsutil ~= 0.6.1
 python-slugify ~= 6.1.2