Bump numpy from 1.18.1 to 1.21.0

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.1 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@v1.18.1...v1.21.0)

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

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

paper_experiments/requirements.txt

@@ -52,7 +52,7 @@ nbformat==4.4.0
 networkx==2.2
 notebook==6.4.1
 numba==0.43.1
-numpy==1.18.4
+numpy==1.21.0
 open3d-python==0.7.0.0
 opencv-python==4.2.0.32
 pandas==0.24.1

requirements.txt

@@ -1,7 +1,7 @@
 cycler==0.10.0
 kiwisolver==1.1.0
 matplotlib==3.1.2
-numpy==1.18.1
+numpy==1.21.0
 opencv-python==4.2.0.32
 pyparsing==2.4.6
 python-dateutil==2.8.1