chore: update Flutter version to 3.27.3

Update the Flutter version to 3.27.3 and adjust the minimum SDK constraints in pubspec.yaml. Update the Flutter version badge in the README files.

.fvmrc

@@ -1,3 +1,3 @@
 {
-  "flutter": "3.27.2"
+  "flutter": "3.27.3"
 }

README.md

@@ -8,7 +8,7 @@
 <p align="center"><a href="https://answer.moodiary.net" target="_blank">Official forum</a>丨QQ Group: <a target="_blank" href="https://qm.qq.com/cgi-bin/qm/qr?k=xGr0TNp_X1z3XEn09_iE_iGSLolQwl6Y&jump_from=webapi&authKey=ZmSb2oEd94FSXxBXRBq53hgTjjvcfmgkQrduB3uL12XtRylPmRlO2OdFz6R25tIo">760014526</a>丨Telegram: <a target="_blank" href="https://t.me/openmoodiary">openmoodiary</a></p>
 
 <div align="center">
-  <img src="https://img.shields.io/badge/Flutter-3.27.2-blue?style=for-the-badge">
+  <img src="https://img.shields.io/badge/Flutter-3.27.3-blue?style=for-the-badge">
   <img src="https://img.shields.io/github/repo-size/ZhuJHua/moodiary?style=for-the-badge&color=ff7070">
   <img src="https://img.shields.io/github/stars/ZhuJHua/moodiary?style=for-the-badge&color=965f8a">
   <img src="https://img.shields.io/github/v/release/ZhuJHua/moodiary?style=for-the-badge&color=4f5e7f">
@@ -87,10 +87,10 @@ Use it by downloading the compiled installation package in Release, or manually
 
 > I always use the latest Flutter version (if possible), using newer versions will bring more features and better performance improvements, never use older versions unless you want your code to become a piece of 💩
 
-- Flutter SDK (>= 3.27.2 Stable) (It is recommended to use FVM to manage the Flutter version)
-- Dart (>= 3.6.1)
-- Rust Toolchain (Optional)
-- Clang/LLVM (Optional)
+- Flutter SDK (>= 3.27.0 Stable) (It is recommended to use FVM to manage the Flutter version)
+- Dart (>= 3.6.0)
+- Rust Toolchain
+- Clang/LLVM
 - Compatible IDE (e.g. Android Studio, Visual Studio Code)
 
 #### Installation procedure

README.zh.md

@@ -8,7 +8,7 @@
 <p align="center"><a href="https://answer.moodiary.net" target="_blank">官方论坛</a>丨QQ群: <a target="_blank" href="https://qm.qq.com/cgi-bin/qm/qr?k=xGr0TNp_X1z3XEn09_iE_iGSLolQwl6Y&jump_from=webapi&authKey=ZmSb2oEd94FSXxBXRBq53hgTjjvcfmgkQrduB3uL12XtRylPmRlO2OdFz6R25tIo">760014526</a>丨Telegram: <a target="_blank" href="https://t.me/openmoodiary">openmoodiary</a></p>
 
 <div align="center">
-  <img src="https://img.shields.io/badge/Flutter-3.27.2-blue?style=for-the-badge">
+  <img src="https://img.shields.io/badge/Flutter-3.27.3-blue?style=for-the-badge">
   <img src="https://img.shields.io/github/repo-size/ZhuJHua/moodiary?style=for-the-badge&color=ff7070">
   <img src="https://img.shields.io/github/stars/ZhuJHua/moodiary?style=for-the-badge&color=965f8a">
   <img src="https://img.shields.io/github/v/release/ZhuJHua/moodiary?style=for-the-badge&color=4f5e7f">
@@ -88,10 +88,10 @@
 
 > 我总是会使用最新的 Flutter 版本（如果可能的话），使用新版本可以带来更多的功能和更好的性能提升，永远不要使用老版本除非你希望代码变成一坨 💩
 
-- Flutter SDK (>= 3.27.2 Stable)（建议使用 fvm 来管理 flutter 版本）
-- Dart (>= 3.6.1)
-- Rust 工具链（可选）
-- Clang/LLVM（可选）
+- Flutter SDK (>= 3.27.0 Stable)（建议使用 fvm 来管理 flutter 版本）
+- Dart (>= 3.6.0)
+- Rust 工具链
+- Clang/LLVM
 - 兼容的 IDE（如 Android Studio、Visual Studio Code）
 
 #### 安装步骤

pubspec.lock

@@ -2864,5 +2864,5 @@ packages:
     source: hosted
     version: "2.0.3"
 sdks:
-  dart: ">=3.6.1 <4.0.0"
-  flutter: ">=3.27.2"
+  dart: ">=3.6.0 <4.0.0"
+  flutter: ">=3.27.0"

pubspec.yaml

@@ -4,8 +4,8 @@ publish_to: 'none'
 version: 2.7.1+71
 
 environment:
-  sdk: '>=3.6.1'
-  flutter: '>=3.27.2'
+  sdk: '>=3.6.0'
+  flutter: '>=3.27.0'
 
 dependencies:
   flutter: