Bump numpy from 1.15.4 to 1.22.0 in /swifr_pkg

Bumps [numpy](https://github.com/numpy/numpy) from 1.15.4 to 1.22.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst)
- [Commits](numpy/numpy@v1.15.4...v1.22.0)

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

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

swifr_pkg/requirements.txt

@@ -104,7 +104,7 @@ nose==1.3.7
 notebook==5.7.4
 numba==0.41.0
 numexpr==2.6.8
-numpy==1.15.4
+numpy==1.22.0
 numpydoc==0.8.0
 odo==0.5.1
 olefile==0.46