fix: set Values type in LocationContext to map

I'm not actually sure what the exact type is. However,
`django-htmx` sets the values parameter type to a `dict[str, str]`.
It only makes sense that I should turn `Values` into `map[string]string`.

Reference: https://django-htmx.readthedocs.io/en/latest/http.html#django_htmx.http.HttpResponseLocation

respheaders.go

@@ -107,7 +107,7 @@ type LocationContext struct {
 	// How the response will be swapped in relative to the target.
 	Swap swapper
 	// Values to submit with the request.
-	Values []string
+	Values map[string]string
 	// Headers to submit with the request
 	Headers map[string]string
 	// Allows you to select the content you want swapped from a response.
@@ -124,7 +124,7 @@ type locationContext struct {
 	Handler string            `json:"handler,omitempty"`
 	Target  string            `json:"target,omitempty"`
 	Swap    swapper           `json:"swap,omitempty"`
-	Values  []string          `json:"values,omitempty"`
+	Values  map[string]string `json:"values,omitempty"`
 	Headers map[string]string `json:"headers,omitempty"`
 	Select  string            `json:"select,omitempty"`
 }