fix(typescript): SSE return type imports (#1658)

- fix: Fix SSE type imports in generated code
  > speakeasy-api/openapi-generation#3306

Co-authored-by: Claude <noreply@anthropic.com>

Author: mfbx9da4

go.mod

@@ -38,7 +38,7 @@ require (
 	github.com/sethvargo/go-githubactions v1.1.0
 	github.com/speakeasy-api/huh v1.1.2
 	github.com/speakeasy-api/openapi v1.7.3
-	github.com/speakeasy-api/openapi-generation/v2 v2.723.4
+	github.com/speakeasy-api/openapi-generation/v2 v2.723.8
 	github.com/speakeasy-api/openapi-overlay v0.10.3
 	github.com/speakeasy-api/sdk-gen-config v1.35.0
 	github.com/speakeasy-api/speakeasy-client-sdk-go/v3 v3.26.7

go.sum

@@ -541,8 +541,8 @@ github.com/speakeasy-api/libopenapi v0.21.9-fixhiddencomps-fixed h1:PL/kpBY5vkBm
 github.com/speakeasy-api/libopenapi v0.21.9-fixhiddencomps-fixed/go.mod h1:Gc8oQkjr2InxwumK0zOBtKN9gIlv9L2VmSVIUk2YxcU=
 github.com/speakeasy-api/openapi v1.7.3 h1:QM9VglcsxRPH19Xr47nYRtDsKOlczCdRRxPYa0pAGz0=
 github.com/speakeasy-api/openapi v1.7.3/go.mod h1:fy+CvRcKj+HDU0QNdnyG6UkfJOEjhqCuNC7o4AtLPAk=
-github.com/speakeasy-api/openapi-generation/v2 v2.723.4 h1:BSPKMPpqI/9WkKpuT0F5wKLWUFOFTf69tlfZghueTpw=
-github.com/speakeasy-api/openapi-generation/v2 v2.723.4/go.mod h1:fy5/XuA7hfY9pJkesh8av1l6PoQT1KFjzLZe38OAYFI=
+github.com/speakeasy-api/openapi-generation/v2 v2.723.8 h1:tn5CZjrKAT5JQmnuHnISBimxlXK6DO5X14vxVFH+wCM=
+github.com/speakeasy-api/openapi-generation/v2 v2.723.8/go.mod h1:fy5/XuA7hfY9pJkesh8av1l6PoQT1KFjzLZe38OAYFI=
 github.com/speakeasy-api/openapi-overlay v0.10.3 h1:70een4vwHyslIp796vM+ox6VISClhtXsCjrQNhxwvWs=
 github.com/speakeasy-api/openapi-overlay v0.10.3/go.mod h1:RJjV0jbUHqXLS0/Mxv5XE7LAnJHqHw+01RDdpoGqiyY=
 github.com/speakeasy-api/sdk-gen-config v1.35.0 h1:9yM5BwCqs+HmbyjIXwy+bciIdZROSJJWp98prFwe0OE=