CI: fix line 2: bad substitution: no closing "" in

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

.github/workflows/release.yml

@@ -99,7 +99,7 @@ jobs:
 
         The sha256sum of the SHA256SUMS file itself is \`${shasha}\` .
         - - -
-        Release manager: [ADD YOUR NAME HERE] (@[ADD YOUR GITHUB ID HERE])`
+        Release manager: [ADD YOUR NAME HERE] (@[ADD YOUR GITHUB ID HERE])
         EOF
     - uses: actions/attest-build-provenance@v1
       if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')