internal/task: remove context timeout

Based on what happened in golang/go#63258, I expect that this will "fix" the
problem. Guess we'll see.

Fixes golang/go#56231

Change-Id: Id398720effc6a2de4eb67c56663154b082edb109
Reviewed-on: https://go-review.googlesource.com/c/build/+/533098
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Heschi Kreinick <[email protected]>

Author: heschi

internal/task/tagx_test.go

@@ -462,8 +462,7 @@ func TestTagXRepos(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	ctx, cancel := context.WithTimeout(deps.ctx, time.Minute)
-	defer cancel()
+	ctx := deps.ctx
 	_, err = w.Run(ctx, &verboseListener{t: t})
 	if err != nil {
 		t.Fatal(err)