Scheduled monthly dependency update for May (#360)

* Update cython from 0.29.22 to 0.29.23

* Update numpy from 1.20.1 to 1.20.2

* Update dask from 2021.2.0 to 2021.4.1

* Update scipy from 1.6.1 to 1.6.3

* Update matplotlib from 3.3.4 to 3.4.1

* Update pandas from 1.2.2 to 1.2.4

* Update scikit-learn from 0.24.1 to 0.24.2

* Update h5py from 3.1.0 to 3.2.1

* Update numexpr from 2.7.2 to 2.7.3

* Update zarr from 2.6.1 to 2.8.1

* Update pomegranate from 0.14.2 to 0.14.4

* Update ipython from 7.21.0 to 7.23.0

requirements_dev_base.txt

@@ -1,4 +1,4 @@
 # required
-cython==0.29.22
-numpy==1.20.1
-dask[array]==2021.2.0
+cython==0.29.23
+numpy==1.20.2
+dask[array]==2021.4.1

requirements_dev_optional.txt

@@ -1,14 +1,14 @@
 # optional
-scipy==1.6.1
-matplotlib==3.3.4
+scipy==1.6.3
+matplotlib==3.4.1
 seaborn==0.11.1
-pandas==1.2.2
-scikit-learn==0.24.1
-h5py==3.1.0
-numexpr==2.7.2
+pandas==1.2.4
+scikit-learn==0.24.2
+h5py==3.2.1
+numexpr==2.7.3
 bcolz==1.2.1
-zarr==2.6.1
+zarr==2.8.1
 hmmlearn==0.2.5
-pomegranate==0.14.2
+pomegranate==0.14.4
 pyfasta==0.5.2
-ipython==7.21.0
+ipython==7.23.0