feat: Flutter SDK update for version 20.2.1

[abnegate]

This PR contains updates to the Flutter SDK for version 20.2.1.

Summary by CodeRabbit

• Documentation

  • Updated changelog for 20.2.1, noting transaction support for Databases and TablesDB.
  • Updated README to reference version 20.2.1.

• Chores

  • Bumped package version to 20.2.1.
  • Updated internal SDK version metadata to 20.2.1.

[coderabbitai]

Walkthrough

This PR bumps the SDK version from 20.2.0 to 20.2.1 across pubspec.yaml, README.md, and the x-sdk-version header in lib/src/client_browser.dart and lib/src/client_io.dart. CHANGELOG.md is updated to 20.2.1 with an entry noting the addition of transaction support for Databases and TablesDB. No exported/public APIs are modified.

Possibly related PRs

• feat: Flutter SDK update for version 20.1.0 #275: Also updates SDK version strings in client_browser.dart, client_io.dart, README, and pubspec.
• feat: Flutter SDK update for version 20.2.0 #276: Updates version metadata and changelog; ties to the transaction features referenced in this PR’s changelog.
• feat: Flutter SDK update for version 20.0.0 #274: Modifies the same x-sdk-version headers in client files as part of a version bump.

Suggested reviewers

• ChiragAgg5k

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly captures the primary intent of the changeset by specifying the Flutter SDK version bump to 20.2.1 and uses a clear conventional prefix, matching the actual modifications across docs and headers.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d1ea40e and fb37b89.

📒 Files selected for processing (5)

• CHANGELOG.md (1 hunks)
• README.md (1 hunks)
• lib/src/client_browser.dart (1 hunks)
• lib/src/client_io.dart (1 hunks)
• pubspec.yaml (1 hunks)

🔇 Additional comments (5)

lib/src/client_browser.dart (1)

43-43: LGTM!

The SDK version header has been correctly updated to match the package version bump.

README.md (1)

24-24: LGTM!

The dependency version in the installation instructions has been correctly updated to reflect the new package version.

pubspec.yaml (1)

2-2: LGTM!

The package version has been correctly bumped to 20.2.1, consistent with all other version references in this PR.

lib/src/client_io.dart (1)

61-61: LGTM!

The SDK version header has been correctly updated to match the package version bump, consistent with the browser client.

CHANGELOG.md (1)

3-5: LGTM!

The changelog entry correctly documents version 20.2.1 with the new transaction support feature. The version is consistent across all files in this release.

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