feat: bump opsportal to v0.8.1

[armandgrillet]

What type of PR is this?
Feature

What this PR does/ why we need it:

Which issue(s) this PR fixes:

• https://jira.d2iq.com/browse/D2IQ-75532

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

- Update opsportal to mitigate CVE-2020-1971

Checklist

• The commit message explains the changes and why are needed.
• The code builds and passes lint/style checks locally.
• The relevant subset of integration tests pass locally.
• The core changes are covered by tests.
• The documentation is updated where needed.

[d2iq-mergebot]

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@mesosphere-mergebot backport  

[armandgrillet]

@mesosphere-mergebot backport release/4

[d2iq-mergebot]

Backport PR for release/4: #1107
Conflicts present in files:

addons/opsportal/opsportal.yaml