Bump numpy from 1.19.3 to 1.21.0 in /python (#23)

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.3 to 1.21.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](numpy/numpy@v1.19.3...v1.21.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

python/requirements.txt

@@ -1,5 +1,5 @@
 dwave-networkx==0.8.10
 matplotlib==3.4.3
 networkx==2.6.3
-numpy==1.19.3
+numpy==1.21.0
 tqdm==4.62.3