Bump numpy from 1.18.5 to 1.22.0 in /lessons/5-NLP

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.5 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](https://github.com/numpy/numpy/compare/v1.18.5...v1.22.0)

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

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

lessons/5-NLP/requirements-pytorch.txt

@@ -2,7 +2,7 @@ gensim==3.8.3
 huggingface==0.0.1
 matplotlib
 nltk==3.5
-numpy==1.18.5
+numpy==1.22.0
 opencv-python==4.5.1.48
 Pillow==7.1.2
 scikit-learn

lessons/5-NLP/requirements-tf.txt

@@ -2,7 +2,7 @@ gensim==3.8.3
 huggingface==0.0.1
 matplotlib
 nltk==3.5
-numpy==1.18.5
+numpy==1.22.0
 opencv-python==4.5.1.48
 Pillow==7.1.2
 scikit-learn