Update Go version 1.20 (#2740)

* Update Go version 1.20
* Update golangci-lint version v1.51.1

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/router/functionHandler.go

@@ -111,11 +111,6 @@ type (
 	}
 )
 
-func init() {
-	// just seeding the random number for getting the canary function
-	rand.Seed(time.Now().UnixNano())
-}
-
 func (w *fakeCloseReadCloser) Close() error {
 	return nil
 }