fix(deps): update module github.com/sashabaranov/go-openai to v1.16.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/sashabaranov/go-openai	require	minor	v1.15.4 -> v1.16.0

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Release Notes

sashabaranov/go-openai (github.com/sashabaranov/go-openai)

v1.16.0

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What's Changed

• Add DotProduct Method and README Example for Embedding Similarity Search by @​ealvar3z in https://github.com/sashabaranov/go-openai/pull/492
• fix: use any for n_epochs by @​henomis in https://github.com/sashabaranov/go-openai/pull/499
• Feat Add headers to openai responses by @​henomis in https://github.com/sashabaranov/go-openai/pull/506
• Support get http header and x-ratelimit-* headers by @​liushuangls in https://github.com/sashabaranov/go-openai/pull/507

Full Changelog: sashabaranov/go-openai@v1.15.4...v1.16.0

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