Update actions/upload-artifact action to v2.3.1

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This PR contains the following updates:

Package	Type	Update	Change
actions/upload-artifact	action	minor	v2.1.4 -> v2.3.1

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Release Notes

actions/upload-artifact (actions/upload-artifact)

v2.3.1

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Fix for empty fails on Windows failing on upload #​281

v2.3.0: Upload Artifact

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• Optimizations for faster uploads of larger files that are already compressed
• Significantly improved logging when there are chunked uploads
• Clarifications in logs around the upload size and prohibited characters that aren't allowed in the artifact name or any uploaded files
• Various other small bugfixes & optimizations

v2.2.4

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• Retry on HTTP 500 responses from the service

v2.2.3

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• Fixes for proxy related issues

v2.2.2

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• Improved retryability and error handling

v2.2.1

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• Update used actions/core package to the latest version

v2.2.0

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• Support for artifact retention

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