Release 3.4.5

[ClarkXia]

• [x] Fix: improve dev sourcemap in speedup mode #6818
• [x] Fix: compile error when import env variables in app config #6821
• [x] Feat: optimize style file injection and support in both webpack and speedup mode #6822
• [x] Fix: align the order and content of custom transformer in different compile mode #6823

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.45%. Comparing base (e2cc5d8) to head (7ae6af3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6824 +/- ## ========================================== - Coverage 79.57% 79.45% -0.12% ========================================== Files 219 219 Lines 19452 19473 +21 Branches 2506 2501 -5 ========================================== - Hits 15478 15473 -5 - Misses 3938 3963 +25 - Partials 36 37 +1 ```

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