chore(deps): update flask-caching requirement from ~=1.4 to ~=1… (fos…

…sasia#6617)

Updates the requirements on [flask-caching](https://github.com/sh4nks/flask-caching) to permit the latest version.
- [Release notes](https://github.com/sh4nks/flask-caching/releases)
- [Changelog](https://github.com/sh4nks/flask-caching/blob/master/CHANGES)
- [Commits](pallets-eco/flask-caching@v1.4.0...v1.8.0)

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

requirements/common.txt

@@ -29,7 +29,7 @@ unicode-slugify~=0.1
 bleach~=3.1
 stripe~=2.40.0
 xhtml2pdf~=0.2
-flask-caching~=1.4
+flask-caching~=1.8
 forex-python~=1.5
 pycryptodome~=3.9.4
 oauth2~=1.9