chore: migrate to Github Action's output files (#379)

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

Author: Skn0tt

.github/workflows/workflow.yml

@@ -41,8 +41,8 @@ jobs:
         run: |-
           os=${{ matrix.os }}
           node=${{ matrix.node-version }}
-          echo "::set-output name=os::${os/-latest/}"
-          echo "::set-output name=node::node_${node//[.*]/}"
+          echo "os=${os/-latest/}" >> $GITHUB_OUTPUT
+          echo "node=node_${node//[.*]/}" >> $GITHUB_OUTPUT
         shell: bash
       - uses: codecov/codecov-action@v3
         with: