[Dependabot]: Update pytooling requirement from ~=8.11 to ~=8.13

Updates the requirements on [pytooling](https://GitHub.com/pyTooling/pyTooling) to permit the latest version.
- [Commits](https://GitHub.com/pyTooling/pyTooling/compare/v8.11.0...v8.13.0)

---
updated-dependencies:
- dependency-name: pytooling
  dependency-version: 8.13.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
-pyTooling ~= 8.11
+pyTooling ~= 8.13
 pyVHDLModel ~= 0.33.0
 #py-flags ~= 1.1