chore: bump very_good_analysis from 5.1.0 to 6.0.0

Bumps [very_good_analysis](https://github.com/VeryGoodOpenSource/very_good_analysis) from 5.1.0 to 6.0.0.
- [Release notes](https://github.com/VeryGoodOpenSource/very_good_analysis/releases)
- [Changelog](https://github.com/VeryGoodOpenSource/very_good_analysis/blob/main/CHANGELOG.md)
- [Commits](VeryGoodOpenSource/very_good_analysis@v5.1.0...v6.0.0)

---
updated-dependencies:
- dependency-name: very_good_analysis
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

lib/src/chart/bar_chart/bar_chart_data.dart

@@ -302,7 +302,7 @@ class BarChartRodData with EquatableMixin {
   /// If you are a fan of stacked charts (If you don't know what is it, google it),
   /// you can fill up the [rodStackItems] to have a Stacked Chart.
   /// for example if you want to have a Stacked Chart with three colors:
-  /// ```
+  /// ```dart
   /// BarChartRodData(
   ///   y: 9,
   ///   color: Colors.grey,
@@ -446,7 +446,7 @@ class BarChartRodData with EquatableMixin {
 class BarChartRodStackItem with EquatableMixin {
   /// Renders a section of Stacked Chart from [fromY] to [toY] with [color]
   /// for example if you want to have a Stacked Chart with three colors:
-  /// ```
+  /// ```dart
   /// BarChartRodData(
   ///   y: 9,
   ///   color: Colors.grey,

lib/src/chart/base/axis_chart/axis_chart_data.dart

@@ -1241,7 +1241,7 @@ class VerticalLineLabel extends FlLineLabel with EquatableMixin {
 /// Holds data for showing a vector image inside the chart.
 ///
 /// for example:
-/// ```
+/// ```dart
 /// Future<SizedPicture> loadSvg() async {
 ///    const String rawSvg = 'your svg string';
 ///    final DrawableRoot svgRoot = await svg.fromSvgString(rawSvg, rawSvg);
@@ -1253,7 +1253,7 @@ class SizedPicture with EquatableMixin {
   /// [picture] is the showing image,
   /// it can retrieve from a svg icon,
   /// for example:
-  /// ```
+  /// ```dart
   ///    const String rawSvg = 'your svg string';
   ///    final DrawableRoot svgRoot = await svg.fromSvgString(rawSvg, rawSvg);
   ///    final picture = svgRoot.toPicture()

pubspec.yaml

@@ -25,7 +25,7 @@ dev_dependencies:
     sdk: flutter
   mockito: ^5.4.2
   vector_math: ^2.1.4 #Added to use in some generated codes of mockito
-  very_good_analysis: ^5.1.0
+  very_good_analysis: ^6.0.0
 
 screenshots:
   - description: 'FL Chart Logo'