Ubuntu GitHub Actions – Ubuntu Package Revision Not Found in GitHub Actions

I use GitHub actions with an Ubuntu 20.04 runner, and since last Saturday, started getting an error in Github actions log. I had not changed the yml config.

The error:

Get:79 http://azure.archive.ubuntu.com/ubuntu focal/universe amd64 proj-bin amd64 6.3.1-1 [88.8 kB]
Fetched 55.7 MB in 1s (61.8 MB/s)
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/c/curl/libcurl4-gnutls-dev_7.68.0-1ubuntu2.5_amd64.deb  404  Not Found [IP: 52.250.76.244 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Error: Process completed with exit code 100.

I checked the repo and there's a bit different version available:

trying to fetch: libcurl4-gnutls-dev_7.68.0-1ubuntu2.5_amd64.deb
      available: libcurl4-gnutls-dev_7.68.0-1ubuntu2.6_amd64.deb

(ubuntu2.6_amd64 vs ubuntu2.5_amd64)

How should I make the installer find this version?

Part of the yml config (complete file):

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: [3.6, 3.7, 3.8, 3.9]

    services:
      postgres:
        # postgres stuff
    steps:
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v2
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        # some python packages