deps(docker): bump dart from 3.2.5-sdk to 3.2.6-sdk (#5233)

Bumps dart from 3.2.5-sdk to 3.2.6-sdk.

---
updated-dependencies:
- dependency-name: dart
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -24,7 +24,7 @@ FROM scalameta/scalafmt:v3.7.17 as scalafmt
 FROM zricethezav/gitleaks:v8.18.1 as gitleaks
 FROM yoheimuta/protolint:0.47.5 as protolint
 FROM ghcr.io/clj-kondo/clj-kondo:2023.12.15-alpine as clj-kondo
-FROM dart:3.2.5-sdk as dart
+FROM dart:3.2.6-sdk as dart
 
 FROM python:3.12.1-alpine3.19 as clang-format