Bump qmcpy from 1.5 to 1.6

Bumps [qmcpy](https://github.com/QMCSoftware/QMCSoftware) from 1.5 to 1.6.
- [Release notes](https://github.com/QMCSoftware/QMCSoftware/releases)
- [Changelog](https://github.com/QMCSoftware/QMCSoftware/blob/master/release.md)
- [Commits](QMCSoftware/QMCSoftware@v1.5...v1.6)

---
updated-dependencies:
- dependency-name: qmcpy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,5 +1,5 @@
 jsonschema>=3.0.1,<5
 numpy>=1.22.4,<1.23
-qmcpy==1.5
+qmcpy==1.6
 scipy>=1.10.1,<2
 typing-extensions>=4.5.0,<5