chore(deps): bump github.com/sashabaranov/go-openai

Bumps [github.com/sashabaranov/go-openai](https://github.com/sashabaranov/go-openai) from 1.26.2 to 1.28.1.
- [Release notes](https://github.com/sashabaranov/go-openai/releases)
- [Commits](sashabaranov/go-openai@v1.26.2...v1.28.1)

---
updated-dependencies:
- dependency-name: github.com/sashabaranov/go-openai
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -21,7 +21,7 @@ require (
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/proxoar/talk-demo-resource/v2 v2.0.4
 	github.com/r3labs/sse/v2 v2.10.0
-	github.com/sashabaranov/go-openai v1.26.2
+	github.com/sashabaranov/go-openai v1.28.1
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.18.2
 	github.com/suyashkumar/ssl-proxy v0.2.7

go.sum

@@ -154,8 +154,8 @@ github.com/sagikazarmark/locafero v0.4.0 h1:HApY1R9zGo4DBgr7dqsTH/JJxLTTsOt7u6ke
 github.com/sagikazarmark/locafero v0.4.0/go.mod h1:Pe1W6UlPYUk/+wc/6KFhbORCfqzgYEpgQ3O5fPuL3H4=
 github.com/sagikazarmark/slog-shim v0.1.0 h1:diDBnUNK9N/354PgrxMywXnAwEr1QZcOr6gto+ugjYE=
 github.com/sagikazarmark/slog-shim v0.1.0/go.mod h1:SrcSrq8aKtyuqEI1uvTDTK1arOWRIczQRv+GVI1AkeQ=
-github.com/sashabaranov/go-openai v1.26.2 h1:cVlQa3gn3eYqNXRW03pPlpy6zLG52EU4g0FrWXc0EFI=
-github.com/sashabaranov/go-openai v1.26.2/go.mod h1:lj5b/K+zjTSFxVLijLSTDZuP7adOgerWeFyZLUhAKRg=
+github.com/sashabaranov/go-openai v1.28.1 h1:aREx6faUTeOZNMDTNGAY8B9vNmmN7qoGvDV0Ke2J1Mc=
+github.com/sashabaranov/go-openai v1.28.1/go.mod h1:lj5b/K+zjTSFxVLijLSTDZuP7adOgerWeFyZLUhAKRg=
 github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
 github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
 github.com/spf13/afero v1.11.0 h1:WJQKhtpdm3v2IzqG8VMqrr6Rf3UYpEF239Jy9wNepM8=