fix: fixes for server auth for MacUpdater

[devinbinnie]

This PR fixes a few issues I found when I was testing the MacUpdater:

• crypto doesn't export a default module, so you have to import the method you want.
• We were encoding the auth header backwards, now we encode into base64 and decode to ascii
• There's an issue with Electron/Squirrel.Mac in which when the proxy server is hit to get the file, it doesn't send any of the specified headers. So I had to rework to just check the first hit for authentication (which you need to get the file name anyways), and the second for the first itself will not be authenticated. Since the file name is randomly generated, this should still avoid the security issue in which an attacker could shut down the server. NOTE: We might want to make the file name a little more secure, but that's up for debate.

Let me know if I need to adjust anything :)

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🦋 Changeset detected

Latest commit: 411a5e5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
electron-updater	Patch

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