Added Mozilla Thunderbird version 78.6.1. (#6282)

manifests/Mozilla/Thunderbird/78.6.1.yaml

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+Id: Mozilla.Thunderbird
+Version: 78.6.1
+Name: Thunderbird
+Publisher: Mozilla
+AppMoniker: thunderbird
+Tags: thunderbird, email, eMail, E-mail, email Client
+Description: Thunderbird is a free email application that’s easy to set up and customize!
+Homepage: https://www.thunderbird.net
+License: Mozilla Public License Version 2.0
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+
+Installers:
+  - Arch: x64
+    Url: https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/78.6.1/win64/en-US/Thunderbird%20Setup%2078.6.1.msi
+    Sha256: 681A8F07A65CA35F5287638E11C68F55AB3C992A3B8D90179F6DD765220E951A
+    InstallerType: msi
+    Language: en-US
+