docs: align README install versions with 5.3.3 release

[devondragon]

Summary

• Updates Maven and Gradle install snippets in README.md from 5.3.2 to 5.3.3 (three occurrences: Installation section, Quick Start Step 1 for Boot 4.x and Boot 3.5 comparison)

Test plan

• Verify version strings in rendered README

https://claude.ai/code/session_01SNYPJ14JEtvyE1LW1MV1t6

[claude]

Review

Straightforward, correct docs update — no concerns.

Verified:

• The three edits (Maven snippet, Gradle snippet in Installation, Gradle snippet in Quick Start Step 1) all correctly bump 5.3.2 → 5.3.3 for the Spring Boot 4.x / 5.3.x line.
• 5.3.3 is indeed the latest released version per CHANGELOG.md (dated 2026-08-20), and gradle.properties is at 5.3.4-SNAPSHOT, so this brings the README back in sync with the actual latest release.
• The PR correctly leaves the separate Spring Boot 3.5 / 3.6.x line (still 3.6.0) untouched — that's a different version track per the compatibility table, so it shouldn't be touched here.
• No other stray 5.3.2 references remain in README.md.

Since this is a docs-only change with no code/behavior impact, the usual code quality / bug / performance / security / test-coverage review criteria don't really apply — nothing to flag there. Good to merge.

[Copilot]

Pull request overview

Updates the README installation instructions so consumers copy/paste the correct library version for the 5.3.3 release, keeping the documentation aligned with the published artifact version.

Changes:

• Bump Maven dependency snippet from 5.3.2 → 5.3.3 for the Spring Boot 4.x line.
• Bump Gradle dependency snippets from 5.3.2 → 5.3.3 in both the Installation section and Quick Start (Boot 4.0/4.1).

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