chore(CI): fix lint errors (#306)

## Problem

Lint tests are failing.

## Solution

Fix lint errors.

Author: joshua-goldstein

.golangci.yml

@@ -2,6 +2,7 @@ run:
   tests: false
   skip-dirs:
     - contrib
+    - sim
 
 linters-settings:
   lll:

z/allocator.go

@@ -57,7 +57,7 @@ func init() {
 
 	// Set up a unique Ref per process.
 	rand.Seed(time.Now().UnixNano())
-	allocRef = uint64(rand.Int63n(1<<16)) << 48
+	allocRef = uint64(rand.Int63n(1<<16)) << 48 //nolint:gosec // cryptographic precision not needed
 
 	calculatedLog2 = make([]int, 1025)
 	for i := 1; i <= 1024; i++ {