Update unidecode requirement from >=1.0 to >=1.4.0

Updates the requirements on [unidecode](https://github.com/kmike/text-unidecode) to permit the latest version.
- [Release notes](https://github.com/kmike/text-unidecode/releases)
- [Commits](https://github.com/kmike/text-unidecode/commits)

---
updated-dependencies:
- dependency-name: unidecode
  dependency-version: 1.4.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 python-dateutil>=2.7
 inflection>=0.3
-unidecode>=1.0
+unidecode>=1.4.0
 Jinja2>=2.10
 ordered-set==4.*
 typing-extensions>=3.1