feat(bundler): enable TLS 1.2 before downloading webview2 bootstrapper

[lucasfernog]

What kind of change does this PR introduce?

• Bugfix
• Feature
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• New Binding issue #___
• Code style update
• Refactor
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Does this PR introduce a breaking change?

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Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
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Other information

[lucasfernog]

This PR changes our WiX powershell script that downloads and runs the Webview2 Bootstrapper to try enabling TLS 1.2 for the current powershell session following the official documentation. We add a try/catch around it because in Windows 7 the Tls12 enum variant might not exist.