Closes gh-12422

Closes gh-12434

Closes gh-12409

Uses snapshots of the Dependency Management Plugin causes problems as
they are only published to our plugins-snapshot repository which may
not be configured in someone's build.

See gh-12406

See gh-12406

Closes gh-12402

Closes gh-12386

Closes gh-12385

Closes gh-12384

Closes gh-12383

Closes gh-11475

See gh-12365

This commit fixes a NPE when the static-locations array of
`ResourceProperties` has to be expanded as the setter is cleaning the
values of the array and is affected by a non-intuitive behaviour of the
binder.

When the binder needs to set an element of an array and the size of the
array isn't large enough, the binder proceeds as follows:

* An array of the required size is created
* The content of the original array is copied over
* The setter of the property is invoked with the new array
* The setter of the property is invoked and the returned array is
mutated to set the requested value

While one would expect the array to contain the requested value when the
setter is invoked, this is not the case. Also, the array might contain
null values if a value at index 8 should be set and the array has a size
of 3.

All in all, `ResourceProperties#appendSlashIfNecessary` has to account
for `null` and an additional round of cleaning has to happen once
binding has completed.

Closes gh-12360

Closes gh-12299

See gh-12344

Closes gh-12325

Closes gh-12297

Fixes gh-12267

Closes gh-11991

* gh-11991:
  Polish "Fix handling of static resource jars with spaces in their paths"
  Fix handling of static resource jars with spaces in their paths

Closes gh-11991

See gh-11991

Closes gh-12250

* gh-12120:
  Polish "Set host when creating Jetty SSL connector"
  Set host when creating Jetty SSL connector

Closes gh-12120

See gh-12120

Closes gh-12132

See gh-12213

This commit updates all `toLowerCase()` and `toUpperCase` invocations to
use the variant that takes a `Locale` to avoid locale-specific side
effect.

Closes gh-12213

Closes gh-12195

Closes gh-12171

Closes gh-12141

Closes gh-12140

Closes gh-12139

Closes gh-12138

This commit makes sure that `@ConfigurationProperties` binding resolves
resources properly. In particular, any `ProtocolResolver` registered on
the `ApplicationContext` is now honoured.

Closes gh-11569

Closes gh-12107