[release] Build DGL package based on ubi7 to support lower glibc version

[Rhett-Ying]

🔨Work Item

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Project tracker: https://github.com/orgs/dmlc/projects/2

Description

For now, it's built based on ubi8 which requires glibc >= 2.27. And it failed to work on ml.g4dn.xlarge instance with Amazon Linux 2.

Depending work items or issues