Add missing slash for release docs

Author: tronical

.github/workflows/build_docs.yaml

@@ -106,7 +106,7 @@ jobs:
                     base_path="/master/docs/slint/"
                 else
                     base_url="https://releases.slint.dev"
-                    base_path="/${{ steps.version.outputs.VERSION }}/docs/slint"
+                    base_path="/${{ steps.version.outputs.VERSION }}/docs/slint/"
                 fi
                 sed -i "s|BASE_URL = \".*\"|BASE_URL = \"$base_url\"|" docs/astro/src/utils/site-config.ts
                 sed -i "s|BASE_PATH = \".*\"|BASE_PATH = \"$base_path\"|" docs/astro/src/utils/site-config.ts