Remove indirect dependency on github.com/pkg/errors

[cbandy]

The github.com/pkg/errors package has been archived for some time.

--- go mod graph # release-2.0
+++ go mod graph # pr-42
@@ -1,11 +1,8 @@
 gomodules.xyz/jsonpatch/v2 github.com/davecgh/go-spew@v1.1.0
-gomodules.xyz/jsonpatch/v2 github.com/evanphx/json-patch@v0.5.2
-gomodules.xyz/jsonpatch/v2 github.com/pkg/errors@v0.9.1
 gomodules.xyz/jsonpatch/v2 github.com/pmezard/go-difflib@v1.0.0
 gomodules.xyz/jsonpatch/v2 github.com/stretchr/testify@v1.3.0
 gomodules.xyz/jsonpatch/v2 go@1.20
-github.com/evanphx/json-patch@v0.5.2 github.com/jessevdk/go-flags@v1.4.0
-github.com/evanphx/json-patch@v0.5.2 github.com/pkg/errors@v0.9.1
+gomodules.xyz/jsonpatch/v2 gopkg.in/evanphx/json-patch.v4@v4.13.0
 github.com/stretchr/testify@v1.3.0 github.com/davecgh/go-spew@v1.1.0
 github.com/stretchr/testify@v1.3.0 github.com/pmezard/go-difflib@v1.0.0
 github.com/stretchr/testify@v1.3.0 github.com/stretchr/objx@v0.1.0

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