chore: Update Mainnet IC revisions subnets file (#3977)

Update mainnet revisions file to include the latest version released on
the mainnet.

This PR is created automatically using
[`mainnet_revisions.py`](https://github.com/dfinity/ic/blob/master/ci/src/mainnet_revisions/mainnet_revisions.py)

Co-authored-by: CI Automation <infra+github-automation@dfinity.org>

mainnet-subnet-revisions.json

@@ -1,6 +1,6 @@
 {
   "subnets": {
     "tdb26-jop6k-aogll-7ltgs-eruif-6kk7m-qpktf-gdiqx-mxtrf-vb5e6-eqe": "5ee8dcf34f26c12defcff51c2f5737214611bccc",
-    "io67a-2jmkw-zup3h-snbwi-g6a5n-rm5dn-b6png-lvdpl-nqnto-yih6l-gqe": "5ee8dcf34f26c12defcff51c2f5737214611bccc"
+    "io67a-2jmkw-zup3h-snbwi-g6a5n-rm5dn-b6png-lvdpl-nqnto-yih6l-gqe": "2008d47a169c4984631c87f2efaa88798e6f14dc"
   }
 }