[Snyk] Security upgrade Grpc from 1.15.0 to 1.20.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `nuget` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • src/REstate.Remote/REstate.Remote.csproj

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	589/1000 Why? Has a fix available, CVSS 7.5	Denial of Service (DoS) SNYK-DOTNET-SYSTEMNETHTTP-60045	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Improper Certificate Validation SNYK-DOTNET-SYSTEMNETHTTP-60046	No	No Known Exploit
	579/1000 Why? Has a fix available, CVSS 7.3	Privilege Escalation SNYK-DOTNET-SYSTEMNETHTTP-60047	No	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Authentication Bypass SNYK-DOTNET-SYSTEMNETHTTP-60048	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Information Exposure SNYK-DOTNET-SYSTEMNETHTTP-72439	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-DOTNET-SYSTEMTEXTREGULAREXPRESSIONS-174708	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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