[Bugfix] Fix broken import

[joerunde]

Post v0.7.3 this class was renamed from LoraNotSupportedWorkerBase to LoRANotSupportedWorkerBase. This causes our import of it to fail, so this PR implements a try/catch on the import for backwards compatibility so that this doesn't break on future vllm releases.

See vllm-project/vllm#13831

Tested on a local install with vllm@b382a7f28

[github-actions]

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[tdoublep]

LGTM

[tdoublep]

Looks like the yapf check is failing here

[yannicks1]

LGTM