travis_retry.sh is not needed on GitHub Actions

At least check_dependencies.yml has not failed here yet.

.github/workflows/macos.yml

@@ -25,9 +25,8 @@ jobs:
           path: src
       - name: Install libraries
         run: |
-          export WAITS='5 60'
+          brew upgrade
-          tool/travis_retry.sh brew upgrade
+          brew install gdbm gmp libffi openssl@1.1 zlib autoconf automake libtool readline
-          tool/travis_retry.sh brew install gdbm gmp libffi openssl@1.1 zlib autoconf automake libtool readline
         working-directory: src
       - name: Set ENV
         run: |