ci, go.mod: bump to go 1.23 (#1094)

* ci, go.mod: bump to go 1.23

Now that go.mod matches our go version, we can stop setting go version
in CI separately.

Signed-off-by: Casey Callendrello <c1@caseyc.net>

* minor: fix lint errors

Bumping golangci-lint to v1.61 introduced some new reasonable checks;
fix the errors they found.

Signed-off-by: Casey Callendrello <c1@caseyc.net>

* ci: bump golangci-lint to v1.61.0

Also, fix some deprecated config directives.

Signed-off-by: Casey Callendrello <c1@caseyc.net>

---------

Signed-off-by: Casey Callendrello <c1@caseyc.net>

plugins/ipam/host-local/main.go

@@ -15,6 +15,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"strings"
@@ -130,7 +131,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 		for _, ip := range requestedIPs {
 			errstr = errstr + " " + ip.String()
 		}
-		return fmt.Errorf(errstr)
+		return errors.New(errstr)
 	}
 
 	result.Routes = ipamConf.Routes
@@ -151,18 +152,18 @@ func cmdDel(args *skel.CmdArgs) error {
 	defer store.Close()
 
 	// Loop through all ranges, releasing all IPs, even if an error occurs
-	var errors []string
+	var errs []string
 	for idx, rangeset := range ipamConf.Ranges {
 		ipAllocator := allocator.NewIPAllocator(&rangeset, store, idx)
 
 		err := ipAllocator.Release(args.ContainerID, args.IfName)
 		if err != nil {
-			errors = append(errors, err.Error())
+			errs = append(errs, err.Error())
 		}
 	}
 
-	if errors != nil {
-		return fmt.Errorf(strings.Join(errors, ";"))
+	if errs != nil {
+		return errors.New(strings.Join(errs, ";"))
 	}
 	return nil
 }