build(deps): update pipx requirement in /.github/workflows

Updates the requirements on [pipx](https://github.com/pypa/pipx) to permit the latest version.
- [Release notes](https://github.com/pypa/pipx/releases)
- [Changelog](https://github.com/pypa/pipx/blob/main/CHANGELOG.md)
- [Commits](pypa/pipx@0.9.0...1.6.0)

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

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

.github/workflows/constraints.txt

@@ -1,5 +1,5 @@
 pip==24.1
-pipx<1.5.0
+pipx<1.7.0
 nox==2023.4.22
 nox-poetry==1.0.3
 virtualenv==20.26.2