chore: bump version to 0.20.0

[ZhanruiSunCh]

PR title

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[JIRA ticket link/nvbug link/github issue link][fix/feat/doc/infra/...] <summary of this PR>

For example, assume I have a PR hope to support a new feature about cache manager of Jira TRTLLM-1000 ticket, it would be like

[TRTLLM-1000][feat] Support a new feature about cache manager

Description

Please explain the issue and the solution in short.

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[ZhanruiSunCh]

/bot run --skip-test

[tensorrt-cicd]

PR_Github #5820 [ run ] triggered by Bot

[ZhanruiSunCh]

/bot skip --comment "Build passed, sanity check build is too slow, skip"

[tensorrt-cicd]

PR_Github #5841 [ skip ] triggered by Bot

[tensorrt-cicd]

PR_Github #5820 [ run ] completed with state ABORTED

[tensorrt-cicd]

PR_Github #5841 [ skip ] completed with state SUCCESS
Skipping testing for commit 197bfc8