update shellcheck location

Author: Evgenii Khramkov

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
       run: |
         sudo apt-get update -y
         sudo apt-get install -y devscripts debhelper moreutils fakeroot jq pigz
-        wget "https://storage.googleapis.com/shellcheck/shellcheck-v0.7.0.linux.x86_64.tar.xz"
+        wget "https://github.com/koalaman/shellcheck/releases/download/v0.7.0/shellcheck-v0.7.0.linux.x86_64.tar.xz"
         tar --xz -xvf "shellcheck-v0.7.0.linux.x86_64.tar.xz"
         sudo cp shellcheck-v0.7.0/shellcheck /usr/bin/shellcheck
       if: matrix.os == 'ubuntu-latest'