Merge rust-bitcoin/rust-secp256k1#739: CI: Run the nightly update job at 5 past midnight

624fd47574484827c269f7779005939761c6047a CI: Run the nightly update job at 5 past midnight (Tobin C. Harding)

Pull request description:

  Currently we run the job at midnight here and in `bitcoin`, this led recently to one using the nightly toolchain from the 10th of Sep and the other using the toolchain from 11th of Sep.

  Update to run at 5 past so this doesn't happen again.

ACKs for top commit:
  apoelstra:
    ACK 624fd47574484827c269f7779005939761c6047a successfully ran local tests

Tree-SHA512: 6fe9a4e2d6c3c04c962f99611f3536a99787393214402a0de2632eb867271560744b842c633c5318281f6e40ad848d42a88bfe6a7f393d19d8601d8e67590620

Author: chain-forgexcr45

.github/workflows/cron-semi-weekly-update-nightly.yml

@@ -1,7 +1,7 @@
 name: Update Nightly rustc
 on:
   schedule:
-    - cron: "0 0 * * 1,4" # runs every Monday and Thursday at 00:00
+    - cron: "5 0 * * 1,4" # runs every Monday and Thursday at 00:05 UTC
   workflow_dispatch: # allows manual triggering
 jobs:
   format: