[Backport 5.2] sec: use fresh grafana image

[sourcegraph-release-bot]

This fixes zlib CVE-2023-45853 for the new release.

Test plan

Ran scan on newly published image:

$ trivy image us.gcr.io/sourcegraph-dev/wolfi-grafana@sha256:963ec6435d899ec8312fd3555f96f117e5cd018218117bb6f89c9313e53ae6a2
2023-11-01T14:10:55.324Z	INFO	Vulnerability scanning is enabled
2023-11-01T14:10:55.324Z	INFO	Secret scanning is enabled
2023-11-01T14:10:55.324Z	INFO	If your scanning is slow, please try '--scanners vuln' to disable secret scanning
2023-11-01T14:10:55.324Z	INFO	Please see also https://aquasecurity.github.io/trivy/v0.46/docs/scanner/secret/#recommendation for faster secret detection
2023-11-01T14:10:55.331Z	INFO	Detected OS: chainguard
2023-11-01T14:10:55.331Z	INFO	Detecting Chainguard vulnerabilities...
2023-11-01T14:10:55.332Z	INFO	Number of language-specific files: 0

us.gcr.io/sourcegraph-dev/wolfi-grafana@sha256:963ec6435d899ec8312fd3555f96f117e5cd018218117bb6f89c9313e53ae6a2 (chainguard 20230214)

Total: 0 (UNKNOWN: 0, LOW: 0, MEDIUM: 0, HIGH: 0, CRITICAL: 0

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    Backport f50ff9f from sec: use fresh grafana image #58045

[sourcegraph-bot]

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