Bump Hugo/Go version in GitHub workflow

.github/workflows/update-themes.yml

@@ -4,7 +4,7 @@ on:
     - cron: "0 0 * * *"
   workflow_dispatch:
 env:
-  HUGO_VERSION: "v0.136.5"
+  HUGO_VERSION: "v0.140.2"
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: "^1.21.0"
+          go-version: "^1.22.0"
       - name: Update submodules
         working-directory: ./cmd/hugothemesitebuilder
         run: |