Update python-publish.yml for github actions

Author: lionel42

.github/workflows/python-publish.yml

@@ -35,7 +35,7 @@ jobs:
       run: echo ::set-output name=TAG_NAME::$(echo $GITHUB_REF | cut -d / -f 3)
     - name: Update version in pyproject.toml
       run: >-
-        sed -i "s/{{VERSION_PLACEHOLDER}}/${{ steps.tag.outputs.TAG_NAME }}/g" pyproject.toml
+        sed -i "s/VERSION_PLACEHOLDER/${{ steps.tag.outputs.TAG_NAME }}/g" pyproject.toml
     - name: Build package
       run: python -m build
     - name: Publish package