Via HLDS:
We've released a second mandatory update to fix some missing files from the first. Apologies for the confusion. You will need to update your servers again. The new version number is 4207643.
Thanks.
-Eric
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Team Fortress 2 update for October 28, 2017
View all patches · Build 2237689 · Last edited November 10, 2017 – 11:50:50 UTC by 
wickedplayer494
Rumor has it:
- Size is close to 10 MB
View TF2 game tracking changes 3768d62bc1 for this build
No meaningful changes could be identified for this build automagically.