Tech 15245 use sha1 digest

[hislopzach]

Using SHA1 instead of SHA256 for script's hexdigest to match the expectations of the graphql-pro gem.

That gem is a private/pro gem doesn't have a visible repo of source code, but I'll copy relevant code here. When it is registering its redis scripts, it uses a SHA1 hexdigest.

module GraphQL
  module Pro
    class RedisScriptClient
      class << self
        def register(name, operation)
          operations[name] = {
            source: operation,
            sha: Digest::SHA1.hexdigest(operation),
          }
        end
#...

Our mock_redis_lua_extension2 gem had been using SHA256, which results in this error in tests

RuntimeError:         RuntimeError: Invariant: Calculated SHA doesn't match Redis SHA ("e755f0271a42601cdab85ad6826cbacb17cd0474", "2a7e9e472a262d83c5c177aaad198d502767644939cf2e2d590620cda9ab6358")

Using a matching SHA/hexdigest will eliminate this error from tests (see clean build here)