Gecko sync update (#2277)

Co-authored-by: Kyle Ju <[email protected]>

Author: moz-wptsync-bot

css/css-break/flexbox/META.yml

@@ -36,6 +36,10 @@ links:
   - test: single-line-column-flex-fragmentation-028.html
   - test: single-line-column-flex-fragmentation-029.html
   url: https://bugzilla.mozilla.org/show_bug.cgi?id=1744845
+- product: firefox
+  results:
+  - test: multi-line-row-flex-fragmentation-017.html
+  url: https://bugzilla.mozilla.org/show_bug.cgi?id=1746045
 - product: firefox
   results:
   - test: multi-line-row-flex-fragmentation-009.html