replace once_cell Lazy with ordinary static

[tottoto]

BTreeMap::new in const context is stabilized at Rust 1.65.

https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.new

[nightkr]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.1%. Comparing base (a868bbf) to head (d6c6203).

❗ Current head d6c6203 differs from pull request most recent head 4848d45. Consider uploading reports for the commit 4848d45 to get more accurate results

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1447   +/-   ##
=====================================
  Coverage   72.1%   72.1%           
=====================================
  Files         78      78           
  Lines       6594    6594           
=====================================
  Hits        4749    4749           
  Misses      1845    1845           

Files	Coverage Δ
kube-core/src/resource.rs	63.6% <100.0%> (ø)