cmd/geth: fixed parallelization flaw in account import test (#22002)

cmd/geth/accountcmd_test.go

@@ -102,6 +102,7 @@ func TestAccountImport(t *testing.T) {
 		},
 	}
 	for _, test := range tests {
+		test := test
 		t.Run(test.name, func(t *testing.T) {
 			t.Parallel()
 			importAccountWithExpect(t, test.key, test.output)