[Snyk] Security upgrade nginx from 1.21-alpine to 1.25.3-alpine (#10007)

<p>This PR was automatically created by Snyk using the credentials of a
real user.</p><br />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

- tools/debug-ui/Dockerfile

We recommend upgrading to `nginx:1.25.3-alpine`, 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 |
| :------: | :-------------------- | :---- | :--------------- |
| ![critical
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/c.png
"critical severity") | **714** | Cleartext Transmission of Sensitive
Information
<br/>[SNYK-ALPINE315-CURL-3320718](https://snyk.io/vuln/SNYK-ALPINE315-CURL-3320718)
| No Known Exploit |
| ![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
"high severity") | **817** | Heap-based Buffer Overflow
<br/>[SNYK-ALPINE315-CURL-5958915](https://snyk.io/vuln/SNYK-ALPINE315-CURL-5958915)
| Proof of Concept |
| ![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
"high severity") | **817** | Heap-based Buffer Overflow
<br/>[SNYK-ALPINE315-CURL-5958915](https://snyk.io/vuln/SNYK-ALPINE315-CURL-5958915)
| Proof of Concept |
| ![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
"high severity") | **829** | Out-of-bounds Write
<br/>[SNYK-ALPINE315-LIBWEBP-5902238](https://snyk.io/vuln/SNYK-ALPINE315-LIBWEBP-5902238)
| Mature |
| ![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
"high severity") | **900** | Resource Exhaustion
<br/>[SNYK-ALPINE315-NGHTTP2-5964211](https://snyk.io/vuln/SNYK-ALPINE315-NGHTTP2-5964211)
| Mature |

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[//]: #
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---

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Author: Ekleog-NEAR