Update dependency to work around envtest 1.18 bug

[matthchr]

The bug in question is json-iterator/go#608

[matthchr]

/ok-to-test sha=ac54d7d

[codecov-commenter]

Codecov Report

Merging #2228 (ac54d7d) into main (a8d54fe) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2228   +/-   ##
=======================================
  Coverage   53.10%   53.11%           
=======================================
  Files         807      807           
  Lines      246736   246736           
=======================================
+ Hits       131037   131042    +5     
+ Misses      97055    97050    -5     
  Partials    18644    18644           

Impacted Files	Coverage Δ
...ilers/arm/azure_generic_arm_reconciler_instance.go	73.94% <0.00%> (-0.53%)	⬇️
...e/v1alpha1api20211001storage/signal_r_types_gen.go	67.09% <0.00%> (+0.27%)	⬆️
v2/internal/testcommon/kube_client_no_cache.go	68.42% <0.00%> (+3.15%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a8d54fe...ac54d7d. Read the comment docs.