chore(deps): update dependency dart to v3.9.4

Author: renovate[bot]

Dockerfile

@@ -167,7 +167,7 @@ ARG NPM_STYLELINT_CONFIG_SASS_GUIDELINES_VERSION=12.1.0
 # renovate: datasource=npm depName=stylelint-scss
 ARG NPM_STYLELINT_SCSS_VERSION=6.12.1
 # renovate: datasource=dart-version depName=dart
-ARG DART_VERSION='3.8.3'
+ARG DART_VERSION='3.9.4'
 # renovate: datasource=github-tags depName=dotenv-linter/dotenv-linter
 ARG DOTENV_LINTER_VERSION=4.0.0
 # renovate: datasource=npm depName=gherkin-lint

linters/dart_dartanalyzer/Dockerfile

@@ -51,7 +51,7 @@ FROM python:3.13-alpine3.22
 # renovate: datasource=github-tags depName=sgerrand/alpine-pkg-glibc
 ARG ALPINE_GLIBC_PACKAGE_VERSION=2.34-r0
 # renovate: datasource=dart-version depName=dart
-ARG DART_VERSION='3.8.3'
+ARG DART_VERSION='3.9.4'
 #ARG__END
 
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megalinter/descriptors/dart.megalinter-descriptor.yml

@@ -86,7 +86,7 @@ linters:
       dockerfile:
         - |-
           # renovate: datasource=dart-version depName=dart
-          ARG DART_VERSION='3.8.3'
+          ARG DART_VERSION='3.9.4'
         - |
           RUN wget --tries=5 https://storage.googleapis.com/dart-archive/channels/stable/release/${DART_VERSION}/sdk/dartsdk-linux-x64-release.zip -O - -q | unzip -q - \
               && mkdir -p /usr/lib/dart \