DEP(deps): Update cachetools requirement from ~=5.5.2 to ~=6.0.0

Updates the requirements on [cachetools](https://github.com/tkem/cachetools) to permit the latest version.
- [Changelog](https://github.com/tkem/cachetools/blob/master/CHANGELOG.rst)
- [Commits](tkem/cachetools@v5.5.2...v6.0.0)

---
updated-dependencies:
- dependency-name: cachetools
  dependency-version: 6.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requeriments.txt

@@ -1,7 +1,7 @@
 pytest
 requests~=2.32.3
 six>=1.16,<2
-cachetools~=5.5.2
+cachetools~=6.0.0
 pycryptodome~=3.22
 pytz~=2025.2
 confuse~=2.0.1

setup.py

@@ -6,7 +6,7 @@
     install_requires=[
         "requests>=2.27.1,<2.33.0",
         "six>=1.16,<1.18",
-        "cachetools>=5.0,<5.6",
+        "cachetools>=5.0,<6.1",
         "pycryptodome>=3.13,<3.23",
         "pytz>=2021.3,<2026.0",
         "confuse>=1.7,<2.1",