ConscryptModuleTest disabled on JDK 26 due to upstream Conscrypt incompatibility

Conscrypt returns hard-coded obsolete signature algorithms (`SHA1withRSA`, `SHA1withECDSA`) which are rejected by JDK 26's new certificate checks in `SunX509KeyManagerImpl`.

The `ConscryptModuleTest` is temporarily disabled on JDK 26 until this is fixed upstream.

**Upstream issue:** https://github.com/google/conscrypt/issues/1486

**Test file:** `tests/test-distribution/test-distribution-common/src/test/java/org/eclipse/jetty/tests/distribution/ConscryptModuleTest.java`

Re-enable the test once Conscrypt releases a version that supports JDK 26's security policy.

Inspect tests/test-distribution/test-distribution-common/src/test/java/org/eclipse/jetty/tests/distribution/ConscryptModuleTest.java and identify how it is disabled on JDK 26. Check upstream Conscrypt issue 1486 and re-enable the test once a compatible Conscrypt release is available, then run the test on JDK 26 to confirm it passes.

Written by the indexing model from the issue text.