chore: bump Go to 1.26.1 and golangci-lint to v2.11.2; fix typos and lint nolints

internal/sarin/helpers.go

@@ -8,7 +8,7 @@ import (
 func NewDefaultRandSource() rand.Source {
 	now := time.Now().UnixNano()
 	return rand.NewPCG(
-		uint64(now),     //nolint:gosec // G115: Safe conversion; UnixNano timestamp used as random seed, bit pattern is intentional
-		uint64(now>>32), //nolint:gosec // G115: Safe conversion; right-shifted timestamp for seed entropy, overflow is acceptable
+		uint64(now),
+		uint64(now>>32),
 	)
 }