fix(gemini): handle 'minimal' reasoning_effort param for gemini-3.1-f…#22920

Sameerlite merged 1 commit intoBerriAI:mainBerriAI/litellm:mainfrom

Varad2001:litellm_gemini_3.1_reasoning_effortVarad2001/litellm:litellm_gemini_3.1_reasoning_effortCopy head branch name to clipboard