fix: switch to import for @octokit/rest

lib/release/release-manager.js

@@ -1,4 +1,3 @@
-const { Octokit } = require('@octokit/rest')
 const core = require('@actions/core')
 const { join } = require('path')
 const semver = require('semver')
@@ -9,7 +8,6 @@ const { request: fetch } = require('undici')
 const { getPublishTag, block, noop } = require('./util')
 
 class ReleaseManager {
-  #octokit
   #owner
   #repo
   #cwd
@@ -28,7 +26,6 @@ class ReleaseManager {
     assert(pr, 'pr is required')
     assert(defaultTag, 'defaultTag is required')
 
-    this.#octokit = new Octokit({ auth: token })
     this.#owner = repo.split('/')[0]
     this.#repo = repo.split('/')[1]
     this.#cwd = cwd
@@ -47,7 +44,9 @@ class ReleaseManager {
   }
 
   async run() {
-    const { data: pullRequest } = await this.#octokit.rest.pulls.get({
+    const {Octokit} = await import('@octokit/rest')
+    const octokit = new Octokit({ auth: token })
+    const { data: pullRequest } = await octokit.rest.pulls.get({
       owner: this.#owner,
       repo: this.#repo,
       pull_number: this.#pr,