refactor: replace x/exp/maps with stdlib maps

[kruskall]

Proposed commit message

maps was added to the stdlib in new go versions

replace old x/exp/maps with stdlib package

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @kruskall? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[pickypg]

LGTM. Nevermind, the diff only showed that line for some reason. Reloading showed me the updated imports. Do we need slices.Collect?

[kruskall]

Do we need slices.Collect?

yeah :(
the stdlib package returns an iterator so we need to collect to a slice for the comparison to work (for loops also works with iterators so it's not necessary there)

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b feat/drop-x-exp upstream/feat/drop-x-exp
git merge upstream/main
git push upstream feat/drop-x-exp