Add change notes for recent Java changes

Author: smowton

java/ql/lib/change-notes/2025-03-18-cyclic-types.md

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+---
+category: fix
+---
+* Java extraction no longer freezes for a long time or times out when using libraries that feature expanding cyclic generic types. For example, this was known to occur when using some classes from the Blazebit Persistence library.

java/ql/lib/change-notes/2025-03-18-gradle-fixes.md

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+---
+category: fix
+---
+* Java build-mode `none` no longer fails when a required version of Gradle cannot be downloaded using the `gradle wrapper` command, such as due to a firewall. It will now attempt to use the system version of Gradle if present, or otherwise proceed without detailed dependency information.

java/ql/lib/change-notes/2025-03-18-maven-enforcer.md

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+---
+category: minorAnalysis
+---
+* Java extraction is now able to download Maven 3.9.x if a Maven Enforcer Plugin configuration indicates it is necessary. Maven 3.8.x is still preferred if the enforcer-plugin configuration (if any) permits it.