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### What this PR does / why we need it? Mark v0.7.1 as unmaintained and v0.7.3 as maintained: vLLM released the v0.7.3 version: https://github.com/vllm-project/vllm/releases/tag/v0.7.3 which include serval commits: - https://github.com/vllm-project/vllm/pull/12874 - https://github.com/vllm-project/vllm/pull/12432 - https://github.com/vllm-project/vllm/pull/13208 We'd better to bump the versions to v0.7.3. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Preview Signed-off-by: Yikun Jiang <yikunkero@gmail.com>