Replace deprecated `set-output` in GitHub Actions before 31st May 2023

[apupier]

used in 2 places:

• compas-sct/.github/workflows/sonarcloud-analysis.yml

  Line 45 in 29aa5fa

  echo "##[set-output name=sonar_opts;]$(echo -Dsonar.host.url=https://sonarcloud.io \

• compas-sct/.github/workflows/release-project.yml

  Line 25 in 29aa5fa

  run: echo "##[set-output name=tagname;]$(echo ${GITHUB_REF##*/})"

see also com-pas/contributing#65