bump ubuntu to bionic

[ericLemanissier]

Specify library name and version: lib/1.0

This is also a good place to share with all of us why you are submitting this PR (specially if it is a new addition to ConanCenter): is it a dependency of other libraries you want to package? Are you the author of the library? Thanks!

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• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Changes not allowed in build 1:

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Items .c3i, .gitattributes, LICENSE can only be modified by maintainers.

[uilianries]

@ericLemanissier Unfortunately it requires internal intervention too. Changing only here will not work. Jenkins machines run a specific CI image, with a wrapper which includes jenkins client. Plus, we need to update Ansible scripts, machines labels and finally validate it internally.

[ericLemanissier]

Yes, this PR has been created unintendedly while my phone was in my pocket, unlocked, from the link in the issue #13472 (comment). I did it twice already... Sorry about that !

[uilianries]

@ericLemanissier No problem. And as the CI is private, being transparent about what is needed to be done, to change that image, is something important.