chore: Update Mainnet IC revisions canisters file (#7780)

Update mainnet system canisters revisions file to include the latest
WASM 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 <[email protected]>

Author: 2 people

mainnet-canister-revisions.json

@@ -112,8 +112,8 @@
     "sha256": "2bcf1c2c8adba6f7bff5e7abda164f22e0a8f6a07120fbe3596c94234727d04c"
   },
   "nns_dapp_test": {
-    "sha256": "bf351f9bf770b9782a785aba5c83559527c4400dec022ad8537b02179cd58631",
-    "tag": "proposal-139207"
+    "sha256": "ab640ac8df064da1c4b9feb3b9938b3cc0a8f578b702a34e99ca9a0e36da7b85",
+    "tag": "proposal-139482"
   },
   "node-rewards": {
     "rev": "a93a3f1eea5cacfd570d96941b5d6f6d2a9b508b",