remove go.mod replace

[suchen-sci]

This pr removes replace in go.mod. replace in go.mod is used for local development.
When use go get github.com/megaease/easegress/v2 to get easegress, golang will not keep the replace part. Which will cause bugs during go build.

[suchen-sci]

github.com/buger/jsonparser => github.com/buger/jsonparser v1.1.1 in require is already v1.1.1. So, remove it changes nothing.

github.com/go-openapi/spec => github.com/go-openapi/spec v0.19.3 is not used anymore.

sigs.k8s.io/kustomize/api => sigs.k8s.io/kustomize/api v0.12.1 and sigs.k8s.io/kustomize/kyaml => sigs.k8s.io/kustomize/kyaml v0.13.9 are updated directly in require.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05% 🎉

Comparison is base (3904080) 81.56% compared to head (ccc0cbb) 81.62%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1046      +/-   ##
==========================================
+ Coverage   81.56%   81.62%   +0.05%     
==========================================
  Files         135      135              
  Lines       15121    15121              
==========================================
+ Hits        12334    12343       +9     
+ Misses       2228     2219       -9     
  Partials      559      559              

Files Changed	Coverage Δ
pkg/cluster/cluster.go	61.15% <ø> (ø)
pkg/cluster/cluster_interface.go	100.00% <ø> (ø)
pkg/cluster/config.go	94.82% <ø> (ø)
pkg/cluster/customdata/customdata.go	74.30% <ø> (ø)
pkg/cluster/member.go	70.81% <ø> (ø)
pkg/cluster/syncer.go	88.46% <ø> (ø)
pkg/cluster/test_util.go	94.11% <ø> (ø)
pkg/cluster/watcher.go	100.00% <ø> (ø)
pkg/filters/builder/builder.go	100.00% <ø> (ø)
pkg/filters/builder/databuilder.go	79.06% <ø> (ø)
... and 85 more

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