feat: Authors feature backend (and upgraded deprecated mods)

test/update_download_http_test.go

@@ -38,6 +38,7 @@ func newDownloadHTTP(t *testing.T, rig *downloadRig) *updateHarness {
 	container := &api.UseCases{
 		Token:                      token,
 		GetUserUseCase:             useCases.NewGetUserUseCase(users),
+		GetMyAuthorUseCase:         useCases.NewGetMyAuthorUseCase(plainAuthors()),
 		GetUpdateStatusUseCase:     rig.status,
 		CheckForUpdateUseCase:      useCases.NewCheckForUpdateUseCase(feed, rig.store, updateRunning, now, discardRecorder),
 		StartUpdateDownloadUseCase: rig.start,