Merge pull request #5515 from jellyfin/fix-refresh-endpoint

fix refresh endpoint

(cherry picked from commit 260b48ef9d)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

Jellyfin.Api/Controllers/LibraryController.cs

@@ -304,7 +304,7 @@ namespace Jellyfin.Api.Controllers
         /// </summary>
         /// <response code="204">Library scan started.</response>
         /// <returns>A <see cref="NoContentResult"/>.</returns>
-        [HttpGet("Library/Refresh")]
+        [HttpPost("Library/Refresh")]
         [Authorize(Policy = Policies.RequiresElevation)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public async Task<ActionResult> RefreshLibrary()