[Dependabot]: Update pytooling requirement from ~=8.0 to ~=8.1

Updates the requirements on [pytooling](https://GitHub.com/pyTooling/pyTooling) to permit the latest version.
- [Commits](https://GitHub.com/pyTooling/pyTooling/compare/v8.0.0...v8.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,3 +1,3 @@
-pyTooling ~= 8.0
+pyTooling ~= 8.1
 pyVHDLModel ~= 0.29.2
 py-flags ~= 1.1