fix(deps): update module golang.org/x/sync to v0.21.0

Author: renovate[bot]

go.mod

@@ -1,18 +1,17 @@
 module go.datum.net/compute
 
-go 1.24.0
-
-toolchain go1.24.2
+go 1.25.0
 
 require (
 	github.com/google/go-cmp v0.7.0
 	github.com/onsi/ginkgo/v2 v2.23.4
 	github.com/onsi/gomega v1.37.0
+	github.com/prometheus/client_golang v1.22.0
 	github.com/stretchr/testify v1.11.1
 	go.datum.net/network-services-operator v0.1.0
 	go.miloapis.com/milo v0.24.11
 	golang.org/x/crypto v0.39.0
-	golang.org/x/sync v0.16.0
+	golang.org/x/sync v0.21.0
 	google.golang.org/protobuf v1.36.11
 	k8s.io/api v0.33.1
 	k8s.io/apimachinery v0.33.2
@@ -59,7 +58,6 @@ require (
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
-	github.com/prometheus/client_golang v1.22.0 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.64.0 // indirect
 	github.com/prometheus/procfs v0.16.1 // indirect

go.sum

@@ -199,6 +199,8 @@ golang.org/x/sync v0.15.0 h1:KWH3jNZsfyT6xfAfKiz6MRNmd46ByHDYaZ7KSkCtdW8=
 golang.org/x/sync v0.15.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
 golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
 golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=