Remove duplicate Go module cache step in release workflow (#100)

The `actions/cache@v4` step was redundant — `actions/setup-go@v5` already
handles Go module caching natively when `cache-dependency-path` is provided.
Both steps were targeting the same paths (`~/.cache/go-build` and
`~/go/pkg/mod`), causing tar extraction to fail with "Cannot open: File
exists" errors during cache restoration.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: wesleyjellis

.github/workflows/release.yaml

@@ -27,15 +27,6 @@ jobs:
           go-version-file: src/go.mod
           cache-dependency-path: |
             src/go.sum
-      - name: Cache Go modules
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.cache/go-build
-            ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-
       - name: Import GPG Key
         id: import_gpg
         uses: crazy-max/ghaction-import-gpg@v6