chore(ci): upgrade audit-check (#1577)

## Summary
This is an upgrade of the `audit-check` package used in CI for running
`cargo audit`.

## Background
This upgrade includes [a
fix](rustsec/audit-check#20) for an issue where
`audit-check` would not respect the committed `Cargo.lock` file.

## Changes
- Upgrade `audit-check`.

.github/workflows/scheduled.yml

@@ -11,6 +11,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: rustsec/audit-check@v1.4.1
+      - uses: rustsec/audit-check@v2.0.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

@@ -127,7 +127,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ env.RUSTUP_TOOLCHAIN }}
-      - uses: rustsec/audit-check@v1.4.1
+      - uses: rustsec/audit-check@v2.0.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}