remove the MPL2.0 license pkg (#563)

* Removed unnecessary dependencies, leading to a cleaner and more efficient project structure.

go.mod

@@ -4,7 +4,6 @@ go 1.20
 
 require (
 	github.com/dsnet/golib/memfile v1.0.0
-	github.com/hashicorp/go-multierror v1.1.1
 	github.com/pion/dtls/v2 v2.2.8-0.20240701035148-45e16a098c47
 	github.com/pion/transport/v3 v3.0.2
 	github.com/stretchr/testify v1.9.0
@@ -16,7 +15,6 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/pion/logging v0.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/crypto v0.24.0 // indirect

go.sum

@@ -3,11 +3,6 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dsnet/golib/memfile v1.0.0 h1:J9pUspY2bDCbF9o+YGwcf3uG6MdyITfh/Fk3/CaEiFs=
 github.com/dsnet/golib/memfile v1.0.0/go.mod h1:tXGNW9q3RwvWt1VV2qrRKlSSz0npnh12yftCSCy2T64=
-github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
-github.com/hashicorp/errwrap v1.1.0 h1:OxrOeh75EUXMY8TBjag2fzXGZ40LB6IKw45YeGUDY2I=
-github.com/hashicorp/errwrap v1.1.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
-github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
-github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
 github.com/pion/dtls/v2 v2.2.8-0.20240701035148-45e16a098c47 h1:WCUn5hJZLLMoOvedDEDA/OFzaYbZy7G71mQ9h5GiQ/o=
 github.com/pion/dtls/v2 v2.2.8-0.20240701035148-45e16a098c47/go.mod h1:8eXNLDNOiXaHvo/wOFnFcr/yinEimCDUQ512tlOSvPo=
 github.com/pion/logging v0.2.2 h1:M9+AIj/+pxNsDfAT64+MAVgJO0rsyLnoJKCqf//DoeY=

message/pool/message.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io"
 
-	multierror "github.com/hashicorp/go-multierror"
 	"github.com/plgd-dev/go-coap/v3/message"
 	"github.com/plgd-dev/go-coap/v3/message/codes"
 	"github.com/plgd-dev/go-coap/v3/net"
@@ -617,13 +616,12 @@ func (r *Message) Clone(msg *Message) error {
 	}
 	_, err = io.Copy(buf, r.Body())
 	if err != nil {
-		var errs *multierror.Error
-		errs = multierror.Append(errs, err)
+		errs := []error{err}
 		_, errS := r.Body().Seek(n, io.SeekStart)
 		if errS != nil {
-			errs = multierror.Append(errs, errS)
+			errs = append(errs, errS)
 		}
-		return errs.ErrorOrNil()
+		return errors.Join(errs...)
 	}
 	_, err = r.Body().Seek(n, io.SeekStart)
 	if err != nil {