Handle multi-value headers and query strings

Upgraded to latest version of github.com/aws/aws-lambda-go, which handles multi-value headers and query strings.

Removed some dependencies, and upgraded to Go 1.24

Supports multiple response headers

This release contains a quick-fix to allow multiple response headers.

If the application needs to set more than one cookie, it needs to send multiple Set-Cookie headers. It is not possible to merge two cookie definitions (see RFC 6265 section 4).

AWS API Gateway recently included support for returning multiple response headers,
but the github.com/aws/aws-lambda-go package has not been updated yet.

This release contains a bit of a hack to support the new format, without changing the public interface.

Sets RequestURI field.

Fixes a bug where the http.Request.RequestURI field was not being set.

Initial release

Add semantic version tag for use with dep and vgo.