Bump version to 0.107

[slyon]

Description

New Netplan release v0.107

Checklist

• Runs make check successfully.
• Retains 100% code coverage (make check-coverage).
• New/changed keys in YAML format are documented.
• (Optional) Adds example YAML for new feature.
• (Optional) Closes an open bug in Launchpad.

[slyon]

A local autopkgtest is looking fine (CI integration tests still failing due to unrelated kernel modules issues):

$ autopkgtest -U . -- lxd autopkgtest/ubuntu/mantic/amd64
[...]
autopkgtest [15:43:09]: @@@@@@@@@@@@@@@@@@@@ summary
ovs                  SKIP exit status 77 and marked as skippable
ethernets            PASS
bridges              PASS
bonds                PASS
routing              PASS
vlans                PASS
wifi                 PASS
tunnels              PASS
scenarios            PASS
regressions          PASS
dbus                 PASS
autostart            PASS
cloud-init           PASS

[slyon]

FTR: Similarly positive test results can also be found on my infrastructure test builds: https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-slyon-testing/?format=plain