merge: bump version to be a -rc (!993)

View MR for information: https://activitypub.software/TransFem-org/Sharkey/-/merge_requests/993

Approved-by: Marie <github@yuugi.dev>
Approved-by: Hazelnoot <acomputerdog@gmail.com>

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "sharkey",
-	"version": "2025.4.1",
+	"version": "2025.4.2-rc",
 	"codename": "shonk",
 	"repository": {
 		"type": "git",

packages/misskey-js/package.json

@@ -1,7 +1,7 @@
 {
 	"type": "module",
 	"name": "misskey-js",
-	"version": "2025.4.1",
+	"version": "2025.4.2-rc",
 	"description": "Misskey SDK for JavaScript",
 	"license": "MIT",
 	"main": "./built/index.js",