Update toolforge requirement from ^5.0.0 to >=5,<7

Updates the requirements on [toolforge]() to permit the latest version.

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

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

pyproject.toml

@@ -22,7 +22,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "^3.7"
 pywikibot = ">=6.6.1,<9.0.0"
-toolforge = {version="^5.0.0", optional=true}
+toolforge = {version=">=5,<7", optional=true}
 
 [tool.poetry.dev-dependencies]
 mypy = "^1.0"