Fix creating refs with the GitHub API

See https://github.com/octokit/rest.js/issues/339#issuecomment-1685256703

.github/workflows/release-branch.yaml

@@ -93,7 +93,7 @@ jobs:
             const [owner, repo] = process.env.GITHUB_REPOSITORY.split('/');
             const branch = process.env.BRANCH;
             const sha = process.env.SHA;
-            const ref = `heads/${branch}`;
+            const ref = `refs/heads/${branch}`;
 
             await github.rest.git.createRef({
               owner,

.github/workflows/tag.yaml

@@ -134,7 +134,7 @@ jobs:
             const tag = await github.rest.git.createRef({
               owner,
               repo,
-              ref: `tags/v${version}`,
+              ref: `refs/tags/v${version}`,
               sha: tagSha,
             });
             console.log("Created tag ref:", tag.data.url);