Update dependency grpc to 1.24.4 [SECURITY]

[renovate[bot]]

This PR contains the following updates:

Package	Change
grpc	1.21.1 -> 1.24.4

GitHub Vulnerability Alerts

CVE-2020-7768

"The package grpc before 1.24.4 and the package @​grpc/grpc-js before 1.1.8 are vulnerable to Prototype Pollution via loadPackageDefinition."

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