bump to 1.17.1 and merge upstream

.github/workflows/build.yml

@@ -24,7 +24,9 @@ env:
   # Release artifacts are still built and attached, so a manual download and
   # flash works exactly as usual.
   #
-  # 1.17.0: normal release.
+  # 1.17.1: normal release. (1.17.0 was bumped but never pushed to master, so it
+  # was never published — 1.17.1 is the first release since 1.16.8 and its notes
+  # carry the 1.17.0 content forward.)
   prerelease: "false"
 
 jobs: