chore: upgrade go 1.20 to 1.21

[hamidzr]

Description

Test Plan

Are we using any third-party libraries that now come with 1.21?
golang/go#57433
replacing maps doesn't seem frictionless

Commentary (optional)

Upgrade from Go 1.20 to Go 1.21: Notable changes

• Language Enhancements:

  • Introduced three new built-in functions: min, max, and clear.
  • Refined package initialization order specification.
  • Significant improvements in type inference capabilities.
  • Enhanced behavior of recover during goroutine panics.

• Toolchain and Compatibility:

  • Updated the -pgo build flag to default to -pgo=auto.

• Library Additions:

  • Added new packages: log/slog (structured logging), testing/slogtest (slog.Handler validation), slices (generic slice operations), maps (generic map operations), and cmp (operations on ordered types).

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

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