feat: update labels on update merge request (#192)

Co-authored-by: JounQin <admin@1stg.me>

Author: Tchoupinax

.changeset/green-phones-wave.md

@@ -0,0 +1,5 @@
+---
+'changesets-gitlab': patch
+---
+
+feat: update labels on update merge request

src/run.ts

@@ -216,6 +216,10 @@ export async function runVersion({
   await exec('git', ['fetch', 'origin', currentBranch])
   await gitUtils.reset(`origin/${currentBranch}`)
 
+  const labels = getOptionalInput('labels')
+    ?.split(',')
+    .map(x => x.trim())
+
   const versionsByDirectory = await getVersionsByDirectory(cwd)
 
   if (script) {
@@ -313,9 +317,7 @@ ${
       {
         description: await mrBodyPromise,
         removeSourceBranch,
-        labels: getOptionalInput('labels')
-          ?.split(',')
-          .map(x => x.trim()),
+        labels,
       },
     )
   } else {
@@ -324,6 +326,7 @@ ${
       title: finalMrTitle,
       description: await mrBodyPromise,
       removeSourceBranch,
+      labels,
     })
   }
 }