build(deps): update traefik docker tag to v3.7.15 (#13477)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [traefik](https://hub.docker.com/_/traefik)
([source](https://redirect.github.com/traefik/traefik)) | patch |
`v3.7.14` → `v3.7.15` |

---

### Release Notes

<details>
<summary>traefik/traefik (traefik)</summary>

###
[`v3.7.15`](https://redirect.github.com/traefik/traefik/blob/HEAD/CHANGELOG.md#v3715-2026-10-15)

[Compare
Source](https://redirect.github.com/traefik/traefik/compare/v3.7.14...v3.7.15)

[All
Commits](https://redirect.github.com/traefik/traefik/compare/v3.7.14...v3.7.15)

**Bug fixes:**

- **\[server]** Reject CONNECT requests regardless of HTTP version
([#&#8203;14031](https://redirect.github.com/traefik/traefik/pull/14031)
[@&#8203;juliens](https://redirect.github.com/juliens))
- **\[server]** Reject CONNECT method before reaching the muxer
([#&#8203;14050](https://redirect.github.com/traefik/traefik/pull/14050)
[@&#8203;juliens](https://redirect.github.com/juliens))
- **\[k8s/crd]** Allow observability metadata on child routers
([#&#8203;14018](https://redirect.github.com/traefik/traefik/pull/14018)
[@&#8203;bunnysayzz](https://redirect.github.com/bunnysayzz))
- **\[k8s/gatewayapi]** Bump sigs.k8s.io/gateway-api to v1.6.3
([#&#8203;14017](https://redirect.github.com/traefik/traefik/pull/14017)
[@&#8203;rtribotte](https://redirect.github.com/rtribotte))
- **\[k8s/gatewayapi]** Default HTTPRoute backend scheme to HTTP when no
appProtocol
([#&#8203;13935](https://redirect.github.com/traefik/traefik/pull/13935)
[@&#8203;Tyagiquamar](https://redirect.github.com/Tyagiquamar))
- **\[k8s/ingress-nginx]** Apply auth-tls client authentication to the
whole host
([#&#8203;14057](https://redirect.github.com/traefik/traefik/pull/14057)
[@&#8203;juliens](https://redirect.github.com/juliens))
- **\[k8s/ingress-nginx]** Fix cross-namespace check on shared
auth-tls-secret TLS options
([#&#8203;14066](https://redirect.github.com/traefik/traefik/pull/14066)
[@&#8203;juliens](https://redirect.github.com/juliens))
- **\[fastproxy]** Add a non-regression test for CR/LF in FastProxy
request headers
([#&#8203;13642](https://redirect.github.com/traefik/traefik/pull/13642)
[@&#8203;mturac](https://redirect.github.com/mturac))
- **\[fastproxy]** Fix concurrent buffer reads on upgraded connections
([#&#8203;14023](https://redirect.github.com/traefik/traefik/pull/14023)
[@&#8203;juliens](https://redirect.github.com/juliens))
- Bump golang.org/x/net to v0.60.0
([#&#8203;14048](https://redirect.github.com/traefik/traefik/pull/14048)
[@&#8203;kevinpollet](https://redirect.github.com/kevinpollet))

**Documentation:**

- **\[security]** Fix typo in the Request Path page
([#&#8203;14036](https://redirect.github.com/traefik/traefik/pull/14036)
[@&#8203;SethFalco](https://redirect.github.com/SethFalco))
- **\[k8s/crd]** Fix broken Kubernetes CRD definitions links in CRD
reference pages
([#&#8203;14047](https://redirect.github.com/traefik/traefik/pull/14047)
[@&#8203;SatvikMishra08](https://redirect.github.com/SatvikMishra08))
- **\[k8s]** Document the safeNaming impact on cross-provider references
([#&#8203;13768](https://redirect.github.com/traefik/traefik/pull/13768)
[@&#8203;lazerg](https://redirect.github.com/lazerg))
- **\[k8s/gatewayapi]** Fix broken links in the Gateway API routing page
([#&#8203;14072](https://redirect.github.com/traefik/traefik/pull/14072)
[@&#8203;Neffi42](https://redirect.github.com/Neffi42))
- Fix broken anchor links to Restrict the Scope of Service Discovery
([#&#8203;14056](https://redirect.github.com/traefik/traefik/pull/14056)
[@&#8203;SatvikMishra08](https://redirect.github.com/SatvikMishra08))
- Add the documentation style guide to the Contributing section
([#&#8203;14061](https://redirect.github.com/traefik/traefik/pull/14061)
[@&#8203;rachana5](https://redirect.github.com/rachana5))
- Remove redundant period in README
([#&#8203;14068](https://redirect.github.com/traefik/traefik/pull/14068)
[@&#8203;mxmrnn](https://redirect.github.com/mxmrnn))

</details>

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internal/suites/example/compose/traefik/compose.v3.yml

@@ -5,7 +5,7 @@
 ---
 services:
   traefik:
-    image: 'traefik:v3.7.14'
+    image: 'traefik:v3.7.15'
     cpus: 2
     mem_limit: 1g
     environment: