Added Signal.Signal v5.3.0 (#13970)

manifests/s/Signal/Signal/5.3.0/Signal.Signal.installer.yaml

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+# yaml-language-server: $schema=https://aka.ms/winget-manifest.installer.1.0.0.schema.json
+PackageIdentifier: Signal.Signal
+PackageVersion: 5.3.0
+MinimumOSVersion: 10.0.0.0
+InstallModes:
+  - interactive
+  - silent
+  - silentWithProgress
+Installers:
+  - Architecture: x86
+    InstallerType: nullsoft
+    InstallerUrl: https://updates.signal.org/desktop/signal-desktop-win-5.3.0.exe
+    InstallerSha256: 74c291231bf81bc2ce4480e246d789fcc07c51c706d553312d480e9afa394a05
+    Scope: user
+    InstallerLocale: en-US
+    UpgradeBehavior: install
+ManifestType: installer
+ManifestVersion: 1.0.0

manifests/s/Signal/Signal/5.3.0/Signal.Signal.locale.en-US.yaml

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+# yaml-language-server: $schema=https://aka.ms/winget-manifest.defaultlocale.1.0.0.schema.json
+PackageIdentifier: Signal.Signal
+PackageVersion: 5.3.0
+PackageLocale: en-US
+Publisher: Open Whisper Systems
+PublisherUrl: https://www.signal.org
+PublisherSupportUrl: https://support.signal.org/hc/en-us
+PrivacyUrl: https://www.signal.org/legal/#privacy-policy
+Author: Open Whisper Systems
+PackageName: Signal
+PackageUrl: https://www.signal.org
+License: GPLv3
+LicenseUrl: https://www.gnu.org/licenses/gpl-3.0.en.html
+Copyright: Copyright 2014-2021 Open Whisper Systems
+CopyrightUrl: https://www.signal.org/legal/#terms-of-service
+ShortDescription: Signal is an encrypted communications application. It uses the Internet to send one-to-one and group messages, which can include files, voice notes, images and videos, and make one-to-one voice and video calls.
+Moniker: signal
+Tags:
+  - messaging
+  - texting
+  - encryption
+  - security
+  - foss
+  - open-source
+  - privacy
+  - chat
+  - cross-platform
+ManifestType: defaultLocale
+ManifestVersion: 1.0.0

manifests/s/Signal/Signal/5.3.0/Signal.Signal.yaml

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+# yaml-language-server: $schema=https://aka.ms/winget-manifest.version.1.0.0.schema.json
+PackageIdentifier: Signal.Signal
+PackageVersion: 5.3.0
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: 1.0.0