Update embroider monorepo

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@embroider/addon-shim (source)	1.8.7 -> 1.8.8
@embroider/macros (source)	1.15.0 -> 1.16.1
@embroider/router (source)	2.1.6 -> 2.1.7

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Configuration

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🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

👻 Immortal: This PR will be recreated if closed unmerged. Get config help if that's undesired.

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[github-actions]

Project	Preview URL1
Limber	https://renovate/embroider-monorepo.limber-glimdown.pages.dev
Tutorial	https://renovate/embroider-monorepo.limber-glimmer-tutorial.pages.dev

Logs

Footnotes

1. if these branch preview links are not working, please check the logs for the commit-based preview link. There is a character limit of 28 for the branch subdomain, as well as some other heuristics, described here for the sake of implementation ease in deploy-preview.yml, that algo has been omitted. The URLs are logged in the wrangler output, but it's hard to get outputs from a matrix job. ↩