Upgrade `set-output` in cd

[rlh1994]

Is your feature request related to a problem? Please describe.
set-output is soon to be disabled and needs upgrading https://github.com/snowplow/snowplow-python-tracker/actions/runs/3393100767/jobs/5640053624#step:4:9

Describe the solution you'd like
Replace

snowplow-python-tracker/.github/workflows/cd.yml

Lines 24 to 25 in ecca49d

	echo ::set-output name=TAG_VERSION::${GITHUB_REF#refs/*/}
	echo "##[set-output name=PYTHON_TRACKER_VERSION;]$(python setup.py --version)"

with new syntax

See: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Describe alternatives you've considered
None

Additional context