Plurl creates ServiceLoader in Constructor which is not thread-safe

[holgergrote]

Current Behavior

In PlurlImpl the method ServiceLoader.load() is called which returns a ServiceLoader. A ServiceLoader is defined by documation as not thread-safe.
This PlurlImpl is stored in URLConnection.setContentHandlerFactory().
When working with URLConnections from different threads this can lead to failures.

Expected Behavior

no exception in concurrent calls from different threads

Steps To Reproduce

Attached a test to demonstrate the error:
ConcurrentRunTest.java

Version

org.eclipse.osgi-3.24.0

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