Upgrade domtrip from 1.5.1 to 1.5.2 (PR #12174)

Cherry-pick from fix/domtrip-1.5.2 branch.
Fixes blank line idempotency in addBlankLineBefore/addBlankLineAfter,
which caused duplicate blank lines on repeated mvnup runs.

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

Author: gnodet

pom.xml

@@ -147,7 +147,7 @@ under the License.
     <byteBuddyVersion>1.18.8</byteBuddyVersion>
     <classWorldsVersion>2.12.0</classWorldsVersion>
     <commonsCliVersion>1.11.0</commonsCliVersion>
-    <domtripVersion>1.5.1</domtripVersion>
+    <domtripVersion>1.5.2</domtripVersion>
     <guiceVersion>5.1.0</guiceVersion>
     <guavaVersion>33.6.0-jre</guavaVersion>
     <guavafailureaccessVersion>1.0.1</guavafailureaccessVersion>