Bump matplotlib from 3.3.3 to 3.3.4

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.3.3 to 3.3.4.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.3.3...v3.3.4)

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

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 # base
 numpy>=1.18.0
 scipy==1.4.1
-matplotlib==3.3.3
+matplotlib==3.3.4
 scikit-learn>=0.22.2,==0.23.*
 six==1.15.0
 Pillow==7.2.0
@@ -21,14 +21,14 @@ keras>=2.2.5
 tensorflow-addons~=0.11.0
 mxnet==1.6.0
 --find-links https://download.pytorch.org/whl/torch_stable.html
-torch==1.6.0
-torchaudio==0.6.0
-torchvision==0.7.0
+torch==1.8.0+cpu
+torchaudio~=0.8.0
+torchvision~=0.9.0
 catboost==0.24.1
 GPy==1.9.9
 lightgbm==3.0.0
 xgboost==1.3.1
-kornia==0.4.0
+kornia~=0.4.0
 
 # Lingvo ASR dependencies
 # supported versions: (lingvo==0.6.4 with tensorflow-gpu==2.1.0)
@@ -37,12 +37,12 @@ kornia==0.4.0
 #lingvo==0.6.4
 
 # other
-pytest==5.4.1
-pytest-pep8==1.0.6
-pytest-mock==3.3.1
-pytest-cov==2.10.1
-codecov==2.1.9
-requests==2.24.0
+pytest~=5.4.1
+pytest-pep8~=1.0.6
+pytest-mock~=3.3.1
+pytest-cov~=2.10.1
+codecov~=2.1.9
+requests~=2.24.0