Change changelog.cjs to mjs file

[carterworks]

Description

fixes a runtime error

Release summary:
- @adobe/alloy -> 2.30.1-beta.21 (patch)
🦋  warn ===============================IMPORTANT!===============================
🦋  warn You are in prerelease mode
🦋  warn If you meant to do a normal release you should revert these changes and run `changeset pre exit`
🦋  warn You can then run `changeset version` again to do a normal release
🦋  warn ----------------------------------------------------------------------
The following error was encountered while generating changelog entries
We have escaped applying the changesets, and no files should have been affected
🦋  error TypeError: githubChangelog.getReleaseLine is not a function
🦋  error     at Object.getReleaseLine (/home/runner/work/alloy/alloy/.changeset/changelog.cjs:33:30)
🦋  error     at /home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+apply-release-plan@7.0.14/node_modules/@changesets/apply-release-plan/dist/changesets-apply-release-plan.cjs.js:159:52
🦋  error     at Array.forEach (<anonymous>)
🦋  error     at getChangelogEntry (/home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+apply-release-plan@7.0.14/node_modules/@changesets/apply-release-plan/dist/changesets-apply-release-plan.cjs.js:156:14)
🦋  error     at /home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+apply-release-plan@7.0.14/node_modules/@changesets/apply-release-plan/dist/changesets-apply-release-plan.cjs.js:417:27
🦋  error     at Array.map (<anonymous>)
🦋  error     at getNewChangelogEntry (/home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+apply-release-plan@7.0.14/node_modules/@changesets/apply-release-plan/dist/changesets-apply-release-plan.cjs.js:416:42)
🦋  error     at async Object.applyReleasePlan [as default] (/home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+apply-release-plan@7.0.14/node_modules/@changesets/apply-release-plan/dist/changesets-apply-release-plan.cjs.js:311:31)
🦋  error     at async version (/home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+cli@2.29.8_@types+node@24.9.1/node_modules/@changesets/cli/dist/changesets-cli.cjs.js:1180:27)
🦋  error     at async run (/home/runner/work/alloy/alloy/node_modules/.pnpm/@changesets+cli@2.29.8_@types+node@24.9.1/node_modules/@changesets/cli/dist/changesets-cli.cjs.js:1339:11)
Error: Process completed with exit code 1.

Related Issue

Motivation and Context

Screenshots (if appropriate):

Checklist:

• I have signed the Adobe Open Source CLA or I'm an Adobe employee.
• I have made any necessary test changes and all tests pass.
• I have run the Sandbox successfully.
• I have added a Changeset (pnpm changeset) or it is not necessary because this PR is not consumer-facing.