* gh-26264:
  Rename nohttp whitelist to allowlist

Closes gh-26264

See gh-26264

sun.security.x509.AlgorithmId.get(String) isn't thread-safe and can
lead to null be returned for an algorithm that should be present.

This commit aims to work around this problem by avoiding the call
to AlgorithmId.get(String). It does so by configuring the
PKCS12 key protection algorithm to one that starts with
pbewithhmacsha (case insensitive). This short-circuits the logic
in PKCS12KeyStore.mapPBEAlgorithmToOID(String) and avoids the call to
AlgorithmId.get(String). Thanks again to @dreis2211 for the
suggestion.

The work around is only used when building with Java 8 as the problem
was fixed in Java 9.

Closes gh-26252

Closes gh-26255

See gh-26248

Closes gh-26247

Fixes gh-26240

Closes gh-26239

Fixes gh-26234

* pr/26209:
  Align Maven version in system requirements with what is actually tested

Closes gh-26209

See gh-26209

Closes gh-26198

Closes gh-26197

Closes gh-25610

Closes gh-26179

Closes gh-26173

Closes gh-26174

* pr/26167:
  Use new update site for Spring Java Format's Eclipse plugin

Closes gh-26167

See gh-26167

Closes gh-26166

* pr/14928:
  Polish "Enhance multiple entity manager factories how-to"
  Enhance multiple entity manager factories how-to

Closes gh-14928

See gh-14928

See gh-14928

Closes gh-26118

This reverts commit 51d57e19.

See gh-25838

See gh-26130

See gh-26130

Closes gh-26130

Closes gh-25907

* pr/25455:
  Polish 'Don't detect CloudPlatform when property is set'
  Don't detect CloudPlatform when property is set

Closes gh-25455

See gh-25455

Update `CloudPlatform.isActive` to back-off from detection when any
`spring.main.cloud-platform` property is set.

See gh-25455

Update `MavenPublishingConventions` to add a new `mavenOptional` feature
that allows us to declare optional dependencies that are also published
in the generated POM.

This change allows us to include the maven-shade-plugin in the
spring-boot-maven-plugin POM which fixes an issue with Eclipse m2e.

Fixes gh-21992

Closes gh-26112

Closes gh-24027

Closes gh-26084

Closes gh-25905

Closes gh-26107

Closes gh-26099