fix(ci): Increase timeout to 6 seconds on restart tests

When fingerprints are missing, it takes much longer to run these
tests, and 3 seconds may not be long enough to exit on slower
runners

cardano-chain-gen/test/Test/Cardano/Db/Mock/Unit/Conway/Config/MigrateConsumedPruneTxOut.hs

@@ -406,7 +406,7 @@ migrateAndPruneRestart =
     newEnv <- replaceConfigFile "test-db-sync-config.json" dbSync
     startDBSync newEnv
     -- There is a slight delay before the flag is checked
-    threadDelay 3_000_000
+    threadDelay 6_000_000
     -- Expected to fail
     checkStillRuns dbSync
   where
@@ -432,7 +432,7 @@ pruneRestartMissingFlag =
     newEnv <- replaceConfigFile "test-db-sync-config.json" dbSync
     startDBSync newEnv
     -- There is a slight delay before the flag is checked
-    threadDelay 3_000_000
+    threadDelay 6_000_000
     -- Expected to fail
     checkStillRuns dbSync
   where
@@ -458,7 +458,7 @@ bootstrapRestartMissingFlag =
     newEnv <- replaceConfigFile "test-db-sync-config.json" dbSync
     startDBSync newEnv
     -- There is a slight delay befor the flag is checked
-    threadDelay 3_000_000
+    threadDelay 6_000_000
     -- Expected to fail
     checkStillRuns dbSync
   where