fix:child-constructor-invocation

[yeasin50]

Description

fixed child-constructor-invocation issue caused on

sdk: '>=2.19.3 <3.0.0' with flutter_lints: ^2.0.0.

As for the example code, it also marches the format.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

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