ci: Move lockfile updates to a script

[clubby789]

This makes manual tweaking a little easier when there are issues.

[rustbot]

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[jieyouxu]

Thanks

View changes since this review

[jieyouxu]

@bors r+ rollup

[rust-bors]

📌 Commit 0895c4c has been approved by jieyouxu

It is now in the queue for this repository.

[ehuss]

This job is now failing:

#151544 (comment)

##[group]Run ./src/tools/update-lockfile.sh
./src/tools/update-lockfile.sh
shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}
env:
  RUSTC_BOOTSTRAP: 1
  PR_TITLE: Weekly `cargo update`
  PR_MESSAGE: Automation to keep dependencies in `Cargo.lock` current.
r? dep-bumps

The following is the output from `cargo update`:

  COMMIT_MESSAGE: cargo update 


##[endgroup]
./src/tools/update-lockfile.sh: 7: set: Illegal option -o pipefail
##[error]Process completed with exit code 2.

[clubby789]

Ah, I guess it'll need updating to /bin/bash given the new options