Makefile: Include go.sum and go.mod in dependencies

Signed-off-by: Noah Meyerhans <nmeyerha@amazon.com>

Author: Noah Meyerhans

Makefile

@@ -10,7 +10,7 @@
 # on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 # express or implied. See the License for the specific language governing
 # permissions and limitations under the License.
-SRCFILES := *.go
+SRCFILES := *.go go.sum go.mod
 
 INSTALLROOT ?= /usr/local
 BINDIR ?= $(INSTALLROOT)/bin