Remove benchmarks workspace dependabot config

[lopopolo]

Missed this in #224.

Dependabot Errors

https://github.com/artichoke/intaglio/network/updates/673728272

Dependabot couldn't find a rust-toolchain

Dependabot couldn't find a rust-toolchain.

Dependabot requires a rust-toolchain to evaluate your Rust dependencies. It had expected to find one at the path: /benchmarks/rust-toolchain.

If this isn't a Rust project, you may wish to disable updates for it in the .github/dependabot.yml config file in this repo.

Learn more

Log output

  proxy | 2023/06/06 00:31:21 proxy starting, commit: c38aa6c5bbd61a43495c6773e7f35d70425ae5be
  proxy | 2023/06/06 00:31:21 Listening (:1080)
updater | 2023-06-06T00:31:22.540439954 [673728272:main:WARN:src/devices/src/legacy/serial.rs:222] Detached the serial input due to peer close/error.
updater | time="2023-06-06T00:31:24Z" level=info msg="guest starting" commit=b9cd055eac194b56e3ca1bef50c6eb968add0362
updater | time="2023-06-06T00:31:24Z" level=info msg="starting job..." fetcher_timeout=10m0s job_id=673728272 updater_timeout=45m0s updater_version=49704c16cb0893c0ab8c5f884471c324baf39b83-cargo
updater | 2023/06/06 00:31:26 INFO Raven 3.1.2 ready to catch errors
updater | 2023/06/06 00:31:28 INFO <job_673728272> Starting job processing
  proxy | 2023/06/06 00:31:28 [002] GET https://api.github.com:443/repos/artichoke/intaglio
  proxy | 2023/06/06 00:31:28 [002] * authenticating github api request with token for api.github.com
  proxy | 2023/06/06 00:31:28 [002] 200 https://api.github.com:443/repos/artichoke/intaglio
  proxy | 2023/06/06 00:31:28 [004] GET https://api.github.com:443/repos/artichoke/intaglio/git/refs/heads/trunk
  proxy | 2023/06/06 00:31:28 [004] * authenticating github api request with token for api.github.com
  proxy | 2023/06/06 00:31:28 [004] 200 https://api.github.com:443/repos/artichoke/intaglio/git/refs/heads/trunk
  proxy | 2023/06/06 00:31:28 [006] GET https://api.github.com:443/repos/artichoke/intaglio/contents/benchmarks?ref=cf5bd3bb7360ae12f0c9c5d7ce7966de96aa9442
  proxy | 2023/06/06 00:31:28 [006] * authenticating github api request with token for api.github.com
  proxy | 2023/06/06 00:31:28 [006] 404 https://api.github.com:443/repos/artichoke/intaglio/contents/benchmarks?ref=cf5bd3bb7360ae12f0c9c5d7ce7966de96aa9442
updater | 2023/06/06 00:31:28 ERROR <job_673728272> Error during file fetching; aborting
updater | 2023/06/06 00:31:29 INFO <job_673728272> Finished job processing
updater | 2023/06/06 00:31:29 INFO Results:
updater | Dependabot encountered '1' error(s) during execution, please check the logs for more details.
updater | +---------------------------+
updater | |          Errors           |
updater | +---------------------------+
updater | | dependency_file_not_found |
updater | +---------------------------+
updater | time="2023-06-06T00:31:29Z" level=info msg="task complete" container_id=job-673728272-file-fetcher exit_code=0 job_id=673728272 step=fetcher
updater | time="2023-06-06T00:31:29Z" level=warning msg="failed during fetch, skipping updater" job_id=673728272

[lopopolo]

https://github.com/artichoke/intaglio/network/updates Dependabot tab is fixed after this merged.