Merge pull request from GHSA-qqrm-9grj-6v32

* maybe ok

* fix

* test wip

* ✌️

* fix

* if (res.ok)

* validateContentTypeSetAsJsonLD

* 条件を考慮し直す

* その他の+json接尾辞が付いているメディアタイプも受け容れる

* https://github.com/misskey-dev/misskey-ghsa-qqrm-9grj-6v32/pull/1#discussion_r1490999009

* add `; profile="https://www.w3.org/ns/activitystreams"`

* application/ld+json;

packages/backend/test/unit/activitypub.ts

@@ -203,7 +203,7 @@ describe('ActivityPub', () => {
 
 	describe('Renderer', () => {
 		test('Render an announce with visibility: followers', () => {
-			rendererService.renderAnnounce(null, {
+			rendererService.renderAnnounce('https://example.com/notes/00example', {
 				id: genAidx(Date.now()),
 				visibility: 'followers',
 			} as MiNote);