Bump torchvision from 0.6.1 to 0.7.0

Bumps [torchvision](https://github.com/pytorch/vision) from 0.6.1 to 0.7.0.
- [Release notes](https://github.com/pytorch/vision/releases)
- [Commits](pytorch/vision@v0.6.1...v0.7.0)

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

Author: dependabot-preview[bot]

examples/requirements-examples.txt

@@ -1,4 +1,4 @@
 torch==1.5.1
 hyperopt==0.2.4
-torchvision==0.6.1
+torchvision==0.7.0
 matplotlib==3.3.0