Increase timeout for bootstrapped tests

tests/run-staging/quote-toExprOfTuple.scala and
tests/run-staging/quote-run-many.scala failed with a timeout on the CI.

Author: smarter

compiler/test/dotty/tools/dotc/BootstrappedOnlyCompilationTests.scala

@@ -21,7 +21,7 @@ class BootstrappedOnlyCompilationTests extends ParallelTesting {
 
   // Test suite configuration --------------------------------------------------
 
-  def maxDuration = 30.seconds
+  def maxDuration = 60.seconds
   def numberOfSlaves = 5
   def safeMode = Properties.testsSafeMode
   def isInteractive = SummaryReport.isInteractive