bump golang.org/grpc to v1.56.3

Bumping golang.org/grpc in light of CVE-2023-44487.

Signed-off-by: Jonathan Gonzalez V <jonathan.abdiel@gmail.com>

vendor/google.golang.org/grpc/resolver/manual/manual.go

@@ -21,6 +21,8 @@
 package manual
 
 import (
+	"sync"
+
 	"google.golang.org/grpc/resolver"
 )
 
@@ -50,6 +52,7 @@ type Resolver struct {
 	scheme        string
 
 	// Fields actually belong to the resolver.
+	mu             sync.Mutex // Guards access to CC.
 	CC             resolver.ClientConn
 	bootstrapState *resolver.State
 }
@@ -62,8 +65,10 @@ func (r *Resolver) InitialState(s resolver.State) {
 
 // Build returns itself for Resolver, because it's both a builder and a resolver.
 func (r *Resolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
-	r.BuildCallback(target, cc, opts)
+	r.mu.Lock()
 	r.CC = cc
+	r.mu.Unlock()
+	r.BuildCallback(target, cc, opts)
 	if r.bootstrapState != nil {
 		r.UpdateState(*r.bootstrapState)
 	}
@@ -87,10 +92,14 @@ func (r *Resolver) Close() {
 
 // UpdateState calls CC.UpdateState.
 func (r *Resolver) UpdateState(s resolver.State) {
+	r.mu.Lock()
 	r.CC.UpdateState(s)
+	r.mu.Unlock()
 }
 
 // ReportError calls CC.ReportError.
 func (r *Resolver) ReportError(err error) {
+	r.mu.Lock()
 	r.CC.ReportError(err)
+	r.mu.Unlock()
 }

vendor/google.golang.org/grpc/resolver/resolver.go

@@ -22,13 +22,13 @@ package resolver
 
 import (
 	"context"
+	"fmt"
 	"net"
 	"net/url"
 	"strings"
 
 	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/internal/pretty"
 	"google.golang.org/grpc/serviceconfig"
 )
 
@@ -124,7 +124,7 @@ type Address struct {
 	Attributes *attributes.Attributes
 
 	// BalancerAttributes contains arbitrary data about this address intended
-	// for consumption by the LB policy.  These attribes do not affect SubConn
+	// for consumption by the LB policy.  These attributes do not affect SubConn
 	// creation, connection establishment, handshaking, etc.
 	BalancerAttributes *attributes.Attributes
 
@@ -151,7 +151,17 @@ func (a Address) Equal(o Address) bool {
 
 // String returns JSON formatted string representation of the address.
 func (a Address) String() string {
-	return pretty.ToJSON(a)
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("{Addr: %q, ", a.Addr))
+	sb.WriteString(fmt.Sprintf("ServerName: %q, ", a.ServerName))
+	if a.Attributes != nil {
+		sb.WriteString(fmt.Sprintf("Attributes: %v, ", a.Attributes.String()))
+	}
+	if a.BalancerAttributes != nil {
+		sb.WriteString(fmt.Sprintf("BalancerAttributes: %v", a.BalancerAttributes.String()))
+	}
+	sb.WriteString("}")
+	return sb.String()
 }
 
 // BuildOptions includes additional information for the builder to create