ci: use older conventional-changelog-conventionalcommits

.github/changelog/config.js

@@ -1,5 +1,5 @@
 'use strict'
-import config from 'conventional-changelog-conventionalcommits';
+const config = require('conventional-changelog-conventionalcommits');
 
 module.exports = config({
   types: [

.github/changelog/pre_changelog_hook.js

@@ -1,6 +1,6 @@
 'use strict'
-import semver from 'semver';
-import core from '@actions/core';
+const semver = require('semver');
+const core = require('@actions/core');
 
 exports.preVersionGeneration = (version) => {
   const {VERSION} = process.env;

.github/changelog/pre_commit_hook.js

@@ -1,6 +1,6 @@
 'use strict'
-import core from '@actions/core';
-import {exec} from '@actions/exec';
+const core = require('@actions/core');
+const {exec} = require('@actions/exec');
 
 exports.preCommit = async (props) => {
   core.startGroup(`Bundling`);