Use direct HTTPS link to download mssql-tools@14

Using the previous URL https://go.microsoft.com/fwlink/?linkid=848963
leads to a 302 redirect to an insecure http:// download URL, which fails
to download when Homebrew is configured with
`HOMEBREW_NO_INSECURE_REDIRECT=1`.

This change makes the formula match the others and their download
locations.

A separate security report has been made about the https to http
redirection.

Formula/mssql-tools@14.0.6.0.rb

@@ -1,7 +1,7 @@
 class MssqlToolsAT14060 < Formula
   desc "Sqlcmd and Bcp for Microsoft(R) SQL Server(R)"
   homepage "https://msdn.microsoft.com/en-us/library/ms162773.aspx"
-  url "https://go.microsoft.com/fwlink/?linkid=848963"
+  url "https://download.microsoft.com/download/F/D/1/FD16AA69-F27D-440E-A15A-6C521A1972E6/mssql-tools-14.0.6.0.tar.gz"
   version "14.0.6.0"
   sha256 "b31cfe98ff3c8f60a98fd02a1ebbe7cf7a2172320239adccd073ad3870786bf9"