Update dependency @embroider/addon-shim to ^1.8.9

[mkszepp]

fix #377

[NullVoxPopuli]

I sent this via DM, but for others, here is the plan:

I would do this series of PRs:

• drop support for node < 18 (This is a breaking change, we won't release right away)
• add @ember/string to the test app
• then we land your embroider update PR
  • at this point, we can make sure CI is green and cut a new major
• then we do a v2 addon conversion
  • can be in a minor, as we already require ember-auto-import@v2

4 prs in total

[NullVoxPopuli]

Why use old range || new range?

[mkszepp]

Why use old range || new range?

not sure, if there is something braking between v0.50 and 1.x... but we can also remove v0.50 if you want

[NullVoxPopuli]

I don't think anything would break, unless folks are pinning the older versions, which it's their own fault at that point