Fix zizmor warning in release workflow (#2826)

Author: adamtheturtle

.github/workflows/release.yml

@@ -56,8 +56,8 @@ jobs:
         uses: jacobtomlinson/gha-find-replace@v3
         with:
           find: "Next\n----"
-          replace: "Next\n----\n\n${{ steps.calver.outputs.release }}\n${{ steps.changelog_underline.outputs.underline\
-            \ }}"
+          replace: |-
+            Next\n----\n\n${{ steps.calver.outputs.release }}\n${{ steps.changelog_underline.outputs.underline }}\n
           include: CHANGELOG.rst
           regex: false