Update dfe autocomplete

[DavidBiddle]

What problem does this pull request solve?

Trello card: None

Updates the dfe-autocomplete package to the latest commit in that repo. This means that:

• we no longer compile the package on every npm install - we'll use the precompiled version of the JS instead. This is what caused our build failures on Bump Ruby to 3.3.0 and Alpine to 3.19 #858.
• we can remove the govuk-if-ie8 mixin workaround we added in Update to govuk frontend v5 #738, since the package no longer uses that mixin. I've done that in this PR.

Things to consider when reviewing

• Ensure that you consider the wider context.
• Does it work when run on your machine?
• Is it clear what the code is doing?
• Do the commit messages explain why the changes were made?
• Are there all the unit tests needed?
• Has all relevant documentation been updated?

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud