[Snyk] Security upgrade debian from jessie-slim to buster-20210408-slim

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• plugins/grpc/Dockerfile

We recommend upgrading to debian:buster-20210408-slim, as this image has only 58 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	671	Out-of-Bounds SNYK-DEBIAN8-GLIBC-356505	Mature
	671	Out-of-Bounds SNYK-DEBIAN8-GLIBC-356505	Mature
	671	Out-of-bounds Write SNYK-DEBIAN8-GLIBC-356850	Mature
	671	Out-of-bounds Write SNYK-DEBIAN8-GLIBC-356850	Mature
	671	Out-of-bounds Write SNYK-DEBIAN8-GLIBC-356850	Mature

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