CI: workaround dependency fetching deadlock for code coverage workflow

Author: Techatrix

.github/workflows/coverage.yml

@@ -18,6 +18,12 @@ jobs:
         with:
           version: master
 
+      - name: prefetch dependencies (workaround)
+        run: |
+          zig fetch https://github.com/ziglibs/known-folders/archive/bafef170a73c064dc706fcfbdc2e406a35681a9c.tar.gz
+          zig fetch https://github.com/ziglibs/diffz/archive/36fc805f459677093c93c210e8f9aed28be13847.tar.gz
+          zig fetch https://github.com/zigtools/lsp-kit/archive/c46ac866dda11ab58e4ba71ed0d8ba21f43e81db.tar.gz
+
       - name: Install kcov
         run: |
           wget https://github.com/SimonKagstrom/kcov/releases/download/v42/kcov-amd64.tar.gz