Using nuget restore from .NET 5.0 no longer requires first updating ca-certificates

[ryanhill1]

Quantum/Build/images/samples/Dockerfile lines 29-38 update ca-certificates package:

    # As per https://github.com/NuGet/Announcements/issues/49,
    # we also need to update the ca-certificates package
    # to use nuget restore from .NET 5.0.
    # This requries enabling debian-unstable, so we do so as a
    # separate command.
    cp /etc/apt/sources.list /etc/apt/sources.list.backup && \
    echo "deb https://deb.debian.org/debian unstable main" >> /etc/apt/sources.list && \
    apt-get -y update && \
    apt-get -y install ca-certificates=20211016 && \
    mv /etc/apt/sources.list.backup /etc/apt/sources.list && \

However, after looking through the updates of the above-linked NuGet issue, it seems that the Debian Family Linux distros that were originally impacted have since resolved the issues. Are lines 29-38 in the samples Dockerfile still necessary? Or am I wrong, and have these later Debian releases still not resolved all lingering issues?

[cgranade]

Ah, thanks for flagging! We'll go on and remove that mitigation, then. @ricardo-espinoza, should we land this with the rest of .NET 6 support, do you think?