update go mod vendor to go work vendor

Fixes:

```
go: 'go mod vendor' cannot be run in workspace mode. Run 'go work vendor' to vendor the workspace or set 'GOWORK=off' to exit workspace mode.
```

Kubernetes project has moved to using go workspaces
kubernetes/kubernetes#123529 

Signed-off-by: Priyanka Saggu <priyankasaggu11929@gmail.com>

projects/kubernetes/build.sh

@@ -99,7 +99,8 @@ printf "package main\nimport ( \n _ \"github.com/AdamKorcz/go-118-fuzz-build/tes
 cat register.go
 
 go mod tidy
-go mod vendor
+# go mod vendor
+go work vendor
 
 # Delete broken fuzzer in 3rd-party dependency.
 find $SRC/kubernetes/vendor/github.com/cilium/ebpf/internal/btf -name "fuzz.go" -exec rm -rf {} \;