infra: Pin hugo-version in GitHub Actions workflow to 0.139.3

Temporary workaround to handle unexpected 404s with the latest release,
0.139.5.

Link: https://github.com/Binary-Eater/binary-eater.github.io/actions/runs/12334251620/job/34424304310
Signed-off-by: Rahul Rameshbabu <[email protected]>

Author: Binary-Eater

Diff for: .github/workflows/gh-pages.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2
         with:
-          hugo-version: 'latest'
+          hugo-version: '0.139.3'
           extended: true
 
       - name: Build