message: chore: remove deprecated add-path from CI
  ## Motivation
  Use of `echo "::add-path::<PATH>"` has been deprecated on GitHub CI.
  ## Solution
  Update CI to use new path setter `echo "<PATH>" >> $GITHUB_PATH`.
diff: @@ -82,7 +82,7 @@ jobs:
  with:
  path: ${{ runner.tool_cache }}/cargo-hack/bin
  key: cargo-hack-bin-${{ hashFiles('.github/caching/cargo-hack.lock') }}
  - - run: echo "::add-path::${{ runner.tool_cache }}/cargo-hack/bin"
  + - run: echo "${{ runner.tool_cache }}/cargo-hack/bin" >> $GITHUB_PATH
  # if `cargo-hack` somehow doesn't exist after loading it from the cache,
  # make *sure* it's there.
  - run: cargo hack --help || { cargo install --force cargo-hack; }
  @@ -303,5 +303,5 @@ jobs:
  with:
  command: install
  args: --root ${{ runner.tool_cache }}/cargo-audit --force cargo-audit
  - - run: echo "::add-path::${{ runner.tool_cache }}/cargo-audit/bin"
  + - run: echo "${{ runner.tool_cache }}/cargo-audit/bin" >> $GITHUB_PATH
  - run: cargo audit
  