fix TOXENV view in GHA

Author: MaxymVlasov

.github/workflows/reusable-tox.yml

@@ -274,7 +274,7 @@ jobs:
         path: dist/
 
     - name: >-
-        Pre-populate tox envs: $TOXENV
+        Pre-populate tox envs: `$TOXENV`
       shell: bash
       env:
         INPUT_BUILT_WHEEL_NAMES: ${{ inputs.built-wheel-names }}
@@ -307,7 +307,7 @@ jobs:
     # But only for 'pytest' env in 'tox'.
     # For details: ../../tox.ini '[testenv:pytest]' 'commands_post'
     - name: >-
-        Run tox envs: $TOXENV
+        Run tox envs: `$TOXENV`
       id: tox-run
       shell: bash
       env: