Replace use of golang.org/x/exp/(maps|slices) with Go standard library

[ewbankkit]

Go 1.21 added slices and maps packages to the standard library.
As we are now using Go 1.21, replace usage of golang.org/x/exp/(maps|slices) with these packages.

Relates #35832.
Relates #35688.

[github-actions]

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[github-actions]

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[github-actions]

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