build: fix variable in build

Author: samedii

.github/workflows/python-publish.yml

@@ -25,7 +25,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}-${{ hashFiles('poetry.lock') }}-${{ GITHUB_REF }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}-${{ hashFiles('poetry.lock') }}-${{ github.ref }}
           restore-keys: |
             ${{ runner.os }}-pip-
             ${{ runner.os }}-