RFR: 8344219: Remove calls to SecurityManager and doPrivileged in java.net.SocksSocketImpl after JEP 486 integration [v2]

[Volkan Yazıcı]

> Removes `SecurityManager` et al. from `SocksSocketImpl`. `tier2` tests have passed – CI run link is available in the ticket.

Volkan Yazıcı has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22271/files
  - new: https://git.openjdk.org/jdk/pull/22271/files/4f7a1f37..5afb92b9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22271&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22271&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22271.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22271/head:pull/22271

PR: https://git.openjdk.org/jdk/pull/22271