chore: add linter that denies importing math/rand (#270)

Author: mauri870

.golangci.yml

@@ -47,7 +47,8 @@ linters:
     - noctx # noctx finds sending http request without context.Context
     - unconvert # Remove unnecessary type conversions
     - wastedassign # wastedassign finds wasted assignment statements.
-    - gomodguard # check for blocked dependencies
+    - gomodguard # check for blocked dependencies in go.mod
+    - depguard # check for blocked dependencies in Go files
 
 # all available settings of specific linters
 linters-settings:
@@ -115,6 +116,14 @@ linters-settings:
         - github.com/elastic/beats/v7:
             reason: "There must be no Beats dependency"
 
+  depguard:
+    rules:
+      main:
+        list-mode: lax
+        deny:
+          - pkg: "math/rand$"
+            desc: "superseded by math/rand/v2"
+
   staticcheck:
     # Select the Go version to target. The default is '1.13'.
     go: "1.22.11"

transport/tlscommontest/test_helper.go

@@ -29,7 +29,7 @@ import (
 	"encoding/pem"
 	"fmt"
 	"math/big"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"os"
 	"path/filepath"

transport/util.go

@@ -20,7 +20,7 @@ package transport
 import (
 	"context"
 	"fmt"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"strings"
 )