Tech Stocks End Higher, Oil Prices Climb &lt;p&gt;&lt;/p&gt;&lt;p&gt; By Megan Davies&lt;/p&gt;&lt;p&gt; NEW YORK (Reuters) - U.S. technology stocks gained onThursday after bellwether Nokia raised its earnings forecast,but blue chips slipped as oil prices climbed almost \$2 perbarrel, increasing concerns about future corporate profits.&lt;/p&gt;