[Snyk] Security upgrade grafana/grafana from latest to 8.1.3

[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

• compose/grafana/Dockerfile

We recommend upgrading to grafana/grafana:8.1.3, as this image has only 0 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
	567	Out-of-bounds Read SNYK-ALPINE313-OPENSSL-1569446	No Known Exploit
	567	Out-of-bounds Read SNYK-ALPINE313-OPENSSL-1569446	No Known Exploit
	667	Buffer Overflow SNYK-ALPINE313-OPENSSL-1569448	No Known Exploit
	667	Buffer Overflow SNYK-ALPINE313-OPENSSL-1569448	No Known Exploit
	667	Buffer Overflow SNYK-ALPINE313-OPENSSL-1569448	No Known Exploit

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