RFR: 7903407: jcstress: Main cannot compile with -Werror due to URL deprecation

[Aleksey Shipilev]

Warning: COMPILATION WARNING :
[INFO] -------------------------------------------------------------
Warning: /home/runner/work/jcstress/jcstress/jcstress-core/src/main/java/org/openjdk/jcstress/Main.java:[74,22] URL(java.lang.String) in java.net.URL has been deprecated

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jcstress/pull/125/files
 Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=125&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903407
  Stats: 18 lines in 1 file changed: 0 ins; 12 del; 6 mod
  Patch: https://git.openjdk.org/jcstress/pull/125.diff
  Fetch: git fetch https://git.openjdk.org/jcstress pull/125/head:pull/125

PR: https://git.openjdk.org/jcstress/pull/125