ci: Get rid of set-output

Fixes #7439

.github/workflows/nightly.yml

@@ -97,8 +97,8 @@ jobs:
       - name: Gather info
         id: info
         run: |
-            echo "::set-output name=date::$(date +'%Y-%m-%d')"
-            echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
+            echo "date=$(date +'%Y-%m-%d')" >> "$GITHUB_OUTPUT"
+            echo "sha_short=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
       - name: Upload artifacts
         uses: actions/upload-artifact@v3
         with:

scripts/dev/recompile_requirements.py

@@ -335,16 +335,15 @@ def print_changed_files():
     print(changes_text)
 
     if utils.ON_CI:
-        print()
-        print('::set-output name=changed::' +
-              files_text.replace('\n', '%0A'))
-        table_header = [
-            '| File | Requirement | old | new |',
-            '|------|-------------|-----|-----|',
-        ]
-        diff_table = '%0A'.join(table_header +
-                                [change.table_str() for change in changes])
-        print('::set-output name=diff::' + diff_table)
+        with open(os.environ["GITHUB_OUTPUT"], "a", encoding="utf-8") as f:
+            f.write('changed=' + files_text.replace('\n', '%0A'))
+            table_header = [
+                '| File | Requirement | old | new |',
+                '|------|-------------|-----|-----|',
+            ]
+            diff_table = '%0A'.join(
+                table_header + [change.table_str() for change in changes])
+            f.write(f'diff={diff_table}')
 
 
 def get_host_python(name):