Merge pull request cupy#4207 from emcastillo/bump-docker-v9

Bump Docker version to v9.0.0a1

Merge pull request cupy#4208 from emcastillo/bump-docker-v8

Bump Docker version to v8.1.0

Merge pull request cupy#4051 from emcastillo/bump-docker

[v8] Bump Docker version to v8.0.0

Merge pull request cupy#3978 from cupy/release-v7.8.0.post1

[v7] Post release 1 for v7.8.0

Merge pull request cupy#3889 from emcastillo/docker-8-rc1

Bump Dockerfile version to v8.0.0rc1

Merge pull request cupy#3815 from asi1024/v7

Bump Dockerfile version to v7.8.0

Merge pull request cupy#3694 from kmaehashi/bump-docker-v8

Bump Dockerfile version to v8.0.0b5

bump Dockerfile version (cupy#3693)

Merge pull request cupy#3489 from asi1024/bump-dockerfile-v8.0.0b4

Bump version in Dockerfile to 8.0.0b4

Merge pull request cupy#3490 from asi1024/bump-dockerfile-v7.6.0

Bump version in Dockerfile to 7.6.0