Update to nginx-ingress-controller v1.9.3

[embik]

What this PR does / why we need it:
nginx-ingress-controller just released v1.9.3. We haven't bumped it in a while, so let's do that.

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?
/kind chore

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Update nginx-ingress-controller to v1.9.3 (fixes CVE-2023-44487, HTTP/2 rapid reset attack)

Documentation:

NONE

[xrstf]

/approve

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 1e880bca86451e4ced0c40209d49dcd1becf0aa2

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xrstf

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• charts/OWNERS [xrstf]

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[embik]

/cherry-pick release/v2.23

[kubermatic-bot]

@embik: #12712 failed to apply on top of branch "release/v2.23":

Applying: Update to nginx-ingress-controller v1.9.3
Using index info to reconstruct a base tree...
M	charts/nginx-ingress-controller/values.yaml
Falling back to patching base and 3-way merge...
Auto-merging charts/nginx-ingress-controller/values.yaml
Applying: Update charts/nginx-ingress fixtures
Using index info to reconstruct a base tree...
M	charts/nginx-ingress-controller/test/default.yaml.out
M	charts/nginx-ingress-controller/test/values.example.ce.yaml.out
M	charts/nginx-ingress-controller/test/values.example.ee.yaml.out
Falling back to patching base and 3-way merge...
Auto-merging charts/nginx-ingress-controller/test/values.example.ee.yaml.out
CONFLICT (content): Merge conflict in charts/nginx-ingress-controller/test/values.example.ee.yaml.out
Auto-merging charts/nginx-ingress-controller/test/values.example.ce.yaml.out
CONFLICT (content): Merge conflict in charts/nginx-ingress-controller/test/values.example.ce.yaml.out
Auto-merging charts/nginx-ingress-controller/test/default.yaml.out
CONFLICT (content): Merge conflict in charts/nginx-ingress-controller/test/default.yaml.out
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0002 Update charts/nginx-ingress fixtures
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release/v2.23

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