Bump numpy in /python/holoviews/examples/apps/django_multi_apps

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.0 to 1.22.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/RELEASE_WALKTHROUGH.rst)
- [Commits](numpy/numpy@v1.18.0...v1.22.0)

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

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

python/holoviews/examples/apps/django_multi_apps/requirements.txt

@@ -18,7 +18,7 @@ incremental==17.5.0
 Jinja2==2.10.3
 Markdown==3.1.1
 MarkupSafe==1.1.1
-numpy==1.18.0
+numpy==1.22.0
 packaging==20.0
 pandas==0.25.3
 panel==0.9.3