ci: use new approach for returning step output

The approach

  - name: Set output
    run: echo "::set-output name={name}::{value}"

is deprecated [1].

Switching to the new approach:

  - name: Set output
    run: echo "{name}={value}" >> $GITHUB_OUTPUT

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

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

(cherry picked from commit 627f6a26)

.github/workflows/reusable_build.yml

@@ -38,7 +38,7 @@ jobs:
           submodules: recursive
       - name: 'Get the commit SHA'
         id: get_sha
-        run: echo "::set-output name=sha::$(git log -1 --format='%H')"
+        run: echo "sha=$(git log -1 --format='%H')" >> $GITHUB_OUTPUT
       - uses: ./.github/actions/environment
       - name: 'Build tarantool packages for ${{ env.OS }}(${{ env.DIST }})'
         id: run_build