This commit upgrades to Hazelcast 4.0.3, yet keeping compatibility with
Hazelcast 3.x.

Closes gh-20856
Closes gh-23475

Closes gh-23478

Closes gh-23477

Previously, the web environment configured on `@SpringBootTest` was not
part of the context cache key. As a result, two test classes that has
identical configuration other than one using a MOCK web environment and
the other using a DEFINED_PORT web environment would share a context
when they should not do so. Classes that use MOCK and RANDOM_PORT were
not affected as the use of RANDOM_PORT results in a property for the
port being added to the environment.

This commit adds a new ContextCustomizer, SpringBootTestWebEnvironment,
that is used to capture the `webEnvironment` from `@SpringBootTest`
and use it in its hashCode and equals implementations. This fixes the
problem as all context customizers are evaluated when determing the
equality of two context cache keys.

Fixes gh-23085

Closes gh-23451

* pr/23465:
  Fix typos

Closes gh-23465

See gh-23465

Closes gh-23467

Closes gh-23470

Closes gh-23471

Closes gh-23469

Closes gh-23466

Closes gh-23472

Closes gh-23473

Closes gh-23468

Closes gh-23462

Closes gh-23461

* pr/23459:
  Fix link to Log4j's JDK Logging Adapter in reference documentation

Closes gh-23459

See gh-23459

* pr/23456:
  Fix typo

Closes gh-23456

See gh-23456

This commit rewrites the test to use an in-memory database rather than
the deprecated Map-based arrangement.

Closes gh-23369

See gh-22983

Closes gh-23453

Closes gh-23452

This commit rework the tip on locating templates when running the app
in the IDE. Using classpath* should not change anything as this won't
make a difference without a pattern in the path.

Closes gh-23068

Closes gh-23370

Closes gh-23419

Closes gh-23448

Closes gh-23447

Closes gh-23389

Closes gh-23446

* pr/23445:
  Fix multi-release JAR test on JDK 15

Closes gh-23445

Backport of 54f93e9b

See gh-23445