fix(api): support accept header in getBookPage (gotson#352)

* fix(api): support accept header in getBookPage

API is documented as supporting `accept: image/*` in the HTTP request,
but doing so results in server response with the status 406.

This commit updates the `GetMapping` annotation to correctly support
these values in the HTTP `accept` header.

closes gotson#350

* fix: failing test

Co-authored-by: Gauthier Roebroeck <gauthier.roebroeck@gmail.com>

komga/src/main/kotlin/org/gotson/komga/interfaces/rest/BookController.kt

@@ -298,7 +298,7 @@ class BookController(
   @GetMapping(value = [
     "api/v1/books/{bookId}/pages/{pageNumber}",
     "opds/v1.2/books/{bookId}/pages/{pageNumber}"
-  ])
+  ], produces = [MediaType.ALL_VALUE])
   @PreAuthorize("hasRole('$ROLE_PAGE_STREAMING')")
   fun getBookPage(
     @AuthenticationPrincipal principal: KomgaPrincipal,