Update dependency SecurityCodeScan.VS2019 to v5.6.3

This MR contains the following updates:

Package	Type	Update	Change
SecurityCodeScan.VS2019 (source)	nuget	patch	5.6.2 -> 5.6.3

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Release Notes

security-code-scan/security-code-scan

v5.6.3

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Release Notes

5.6.3

• #​248 Be able to exit with non-zero error code when warnings are found

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