[Dependabot]: Update pyvhdlmodel requirement from ~=0.31 to ~=0.33

Updates the requirements on [pyvhdlmodel](https://GitHub.com/VHDL/pyVHDLModel) to permit the latest version.
- [Commits](https://GitHub.com/VHDL/pyVHDLModel/compare/v0.31.0...v0.33.0)

---
updated-dependencies:
- dependency-name: pyvhdlmodel
  dependency-version: 0.33.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 pyTooling ~= 8.8
-pyVHDLModel ~= 0.31
+pyVHDLModel ~= 0.33
 pySVModel ~= 0.5
 pySystemRDLModel ~= 0.3