changes: file for 23507, v3 onion service fix

changes/bug23507

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+  o Minor bugfixes (v3 single onion services):
+    - Make v3 single onion services fall back to a 3-hop intro, when there
+      all intro points are unreachable via a 1-hop path. Previously, v3
+      single onion services failed when all intro nodes were unreachable
+      via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.