[stable/sentry] Fix sentry icon

[asherf]

The sentry icon is currently broken. See https://hub.helm.sh/charts?q=sentry

Fix icon based on https://sentry.io/branding/
This PR updates the URL to use a supported link that is not likely to get broken (see https://sentry.io/branding/)

What this PR does / why we need it:

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

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Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md
• title of the PR contains starts with chart name e.g. [stable/chart]

[k8s-ci-robot]

Hi @asherf. Thanks for your PR.

I'm waiting for a helm member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[davidkarlsen]

/ok-to-test
/assign
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asherf, davidkarlsen

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