ci: bump to go 1.23 (#453)

Upgrade to Go 1.23.

Upgrade also requires bumping `golangci-lint` to v1.62.2, and upgrading
third-party test versions for some failing cases.

tests/thirdparty/packages_test.go

@@ -34,7 +34,6 @@ func TestPackages(t *testing.T) {
 	}
 
 	for _, tst := range s.Projects.Tests() {
-		tst := tst // scopelint
 		t.Run(tst.ID(), func(t *testing.T) {
 			if tst.Project.Skip() {
 				t.Skipf("skip: %s", tst.Project.Reason())