fix docs build

Author: loongs-zhang

.github/workflows/release.yml

@@ -32,7 +32,7 @@ jobs:
           toolchain: stable
       - name: Update version in Cargo.toml
         run: |
-          VERSION=$(echo ${{ github.ref }} | sed 's/refs\/tags\/v//')
+          VERSION=$(echo ${{ github.ref }} | sed 'refs\/tags\/v//')
           sed -i "s/^version = .*/version = \"$VERSION\"/" ${{ github.workspace }}/Cargo.toml
       - name: Dryrun ${{ matrix.package }}
         working-directory: ${{ matrix.package }}