Bazel: Add support for JDK 21

There are two failing tests when switching to JDK 21.

One failure is related to the changed behaviour related to the locale
providers. Adapt `GitDateFormatterTest` to changes in unicode [1].

Second failure related to changed behaviour in URL.openConnection(),
see: [2] for more details.

Before JDK 20, some of the parsing/validation performed by the JDK
built-in URLStreamHander implementations were delayed until
URL::openConnection or URLConnection::connect was called. Starting
JDK 20, some of these parsing/validations are now performed early,
i.e. within URL constructors.

IOW, the assumption made in HttpSupport.TesttestMalformedUri() isn't
met any more: providing mailformed URI to the URL ctor now throws an
exception starting with JDK 20. To rectify the problem, remove the
offending test.

Test plan:

To build with JDK 21 and run the tests locally:

  $> bazel test --config=java21 //...

To build with JDK 21 and run the tests on RBE:

  $> bazel test --config=remote21 --remote_instance_name=$PROJECT //...

[1] https://bugs.openjdk.org/browse/JDK-8304925
[2] https://bugs.openjdk.org/browse/JDK-8293590

Change-Id: I796de67f7945d5f1fa5e8146f4ec8cbe9ac7bd3e

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