Archive maven-3.8.x branch (EOL)

The 3.8.x release stream reached end-of-life; see dev@ discussion:
https://lists.apache.org/thread/2t99pftq06j25rq7j3h1l0z5xsn57z6b

This tag preserves the branch's final state (last real content is the
maven-3.8.9 release plus the automatic next-development-iteration bump)
before the branch itself is removed.

[maven-release-plugin] prepare release maven-4.0.0-rc-6

[maven-release-plugin] copy for tag maven-3.10.0-rc-1

Fix #12087: add surefire and failsafe plugins to PluginUpgradeStrategy

Older versions of maven-surefire-plugin and maven-failsafe-plugin
(e.g. 3.1.2) are incompatible with Maven 4, failing with
IllegalStateException in MojoExecutionScopeModule. Add both plugins
with minimum version 3.5.2 so mvnup upgrades them automatically.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

[maven-release-plugin] copy for tag maven-3.9.16

[maven-release-plugin] copy for tag maven-3.9.15

[maven-release-plugin] copy for tag maven-3.9.14

[maven-release-plugin] copy for tag maven-3.9.13

[maven-release-plugin] copy for tag maven-3.9.12

[maven-release-plugin] copy for tag maven-4.0.0-rc-5