Bump golang.org/x/net in /chaincodes/pdc

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.0.0-20210119194325-5f4716e94777 to 0.7.0.
- [Release notes](https://github.com/golang/net/releases)
- [Commits](https://github.com/golang/net/commits/v0.7.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

chaincodes/pdc/go.mod

@@ -3,17 +3,19 @@ module pdc
 go 1.12
 
 require (
+	github.com/Knetic/govaluate v3.0.0+incompatible // indirect
+	github.com/Shopify/sarama v1.38.1 // indirect
 	github.com/fsouza/go-dockerclient v1.7.0 // indirect
-	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2 // indirect
+	github.com/hashicorp/go-version v1.6.0 // indirect
 	github.com/hyperledger/fabric v1.4.9
 	github.com/hyperledger/fabric-amcl v0.0.0-20200424173818-327c9e2cf77a // indirect
+	github.com/miekg/pkcs11 v1.1.1 // indirect
+	github.com/onsi/ginkgo v1.16.5 // indirect
+	github.com/onsi/gomega v1.27.1 // indirect
 	github.com/op/go-logging v0.0.0-20160315200505-970db520ece7 // indirect
 	github.com/spf13/viper v1.7.1 // indirect
 	github.com/sykesm/zap-logfmt v0.0.4 // indirect
 	go.uber.org/zap v1.16.0 // indirect
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
-	golang.org/x/net v0.0.0-20210119194325-5f4716e94777 // indirect
 	google.golang.org/grpc v1.35.0 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 )