[lit][test] Relax time regex in xunit failure test

We don't care how long any of this took. Due to OS scheduling,
one or more parts of the test may be delayed for any amount of
time.

Author: DavidSpickett

llvm/utils/lit/tests/xunit-output-report-failures-only.py

@@ -5,7 +5,7 @@
 # CHECK:      <?xml version="1.0" encoding="UTF-8"?>
 # CHECK-NEXT: <testsuites time="{{[0-9.]+}}">
 # CHECK-NEXT: <testsuite name="test-data" tests="1" failures="1" skipped="0" time="{{[0-9.]+}}">
-# CHECK-NEXT: <testcase classname="test-data.test-data" name="bad&amp;name.ini" time="{{[0-1]\.[0-9]+}}">
+# CHECK-NEXT: <testcase classname="test-data.test-data" name="bad&amp;name.ini" time="{{[0-9.]+}}">
 # CHECK-NEXT:   <failure><![CDATA[& < > ]]]]><![CDATA[> &"]]></failure>
 # CHECK-NEXT: </testcase>
 # CHECK-NEXT: </testsuite>