refactor: omit unnecessary reassignment (#2584)

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## Overview

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The new version of Go has been optimized, and variables do not need to
be reassigned.

Inspired by helm/helm#31134

Signed-off-by: deepdring <deepdrink@icloud.com>

Author: deepdring

block/namespace_test.go

@@ -130,7 +130,6 @@ func TestProcessNextDAHeaderAndData_MixedResults(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -234,7 +233,6 @@ func TestNamespaceMigration_Completion(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -426,7 +424,6 @@ func TestLegacyNamespaceDetection(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()