Failure to download and install DVC

[BotScutters]

This seems to be a recurrence of the issue that was discussed in #59.

With a configuration like:

on: 
  workflow_dispatch: {}
  pull_request: {}
jobs:
  pr:
    runs-on: ubuntu-20.04
    steps:
      - uses: iterative/setup-dvc@v1

We've been intermittently getting the following error:

Run iterative/setup-dvc@v1
  with:
    version: latest
  env:
    SEMVER_SUFFIX: pr
    SSH_AUTH_SOCK: /tmp/ssh-i8XfxLMrNycQ/agent.132198
    SSH_AGENT_PID: 132199
    AWS_DEFAULT_REGION: us-east-2
    AWS_REGION: us-east-2
    AWS_ACCESS_KEY_ID: ***
    AWS_SECRET_ACCESS_KEY: ***
    pythonLocation: /opt/hostedtoolcache/Python/3.10.15/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.10.15/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.10.15/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.10.15/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.10.15/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.10.15/x64/lib
Installing DVC from: https://dvc.org/download/linux-deb/dvc-undefined
DVC Download Failed, trying from GitHub Releases
Installing DVC from: https://github.com/iterative/dvc/releases/download/undefined/dvc_undefined_amd64.deb
Error: Not Found

As mentioned above, this issue is strangely intermittent. My team has seen it happen on 3 different occasions in the past 2 weeks, and each time the process starts to work again (eventually) after retrying, though yesterday I had to retry the job 5 times before it eventually worked. The inconsistency here makes it particularly hard to reliably reproduce, but suggests there may be some reliability issues with the endpoint being used to fetch the version.