Bump golang.org/x/sync from 0.20.0 to 0.21.0 (#875)

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.20.0 to 0.21.0.
- [Commits](golang/sync@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sync
  dependency-version: 0.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/stretchr/testify v1.11.1
 	github.com/wI2L/jsondiff v0.7.1
 	golang.org/x/mod v0.37.0
-	golang.org/x/sync v0.20.0
+	golang.org/x/sync v0.21.0
 )
 
 require (

go.sum

@@ -46,8 +46,8 @@ github.com/wI2L/jsondiff v0.7.1 h1:Fg9+yj+1/x3UtPBJhR91TKEzRkrEEWcAcLbg9dzEaNM=
 github.com/wI2L/jsondiff v0.7.1/go.mod h1:yAt2W7U6Jd4HK0RA8DGSGk0zDtfEtOUUJVnH/xICpjo=
 golang.org/x/mod v0.37.0 h1:vF1DjpVEshcIqoEaauuHebaLk1O1forxjxBaVn884JQ=
 golang.org/x/mod v0.37.0/go.mod h1:m8S8VeM9r4dzDwjrKO0a1sZP3YjeMamRRlD+fmR2Q/0=
-golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
-golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=