chore: remove unnecessary loop variable captures (#22180)

Since Go 1.22, the loop variable capture issue is resolved. Variables
declared by for loops are now per-iteration rather than per-loop, making
the 'v := v' pattern unnecessary.

coderd/workspaceagents_test.go

@@ -606,7 +606,6 @@ func TestWorkspaceAgentAppStatus_ActivityBump(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
 
@@ -1920,7 +1919,6 @@ func TestWorkspaceAgentDeleteDevcontainer(t *testing.T) {
 	}
 
 	for _, tc := range tests {
-		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()