all: upgrade to go@v1.13.11 and go@v1.14.3

Change-Id: I0d7ab08ef693de0199544c4bc94ebeedb87144f2
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/234938
Reviewed-by: Herbie Ong <herbie@google.com>
diff --git a/integration_test.go b/integration_test.go
index 07bda42..6118088 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -33,7 +33,7 @@
 	buildRelease = flag.Bool("buildRelease", false, "build release binaries")
 
 	protobufVersion = "ef7cc811" // v3.12.0-rc1
-	golangVersions  = []string{"1.9.7", "1.10.8", "1.11.13", "1.12.17", "1.13.8", "1.14"}
+	golangVersions  = []string{"1.9.7", "1.10.8", "1.11.13", "1.12.17", "1.13.11", "1.14.3"}
 	golangLatest    = golangVersions[len(golangVersions)-1]
 
 	// purgeTimeout determines the maximum age of unused sub-directories.