Bump version to 4.1.3

- Version bump from 4.1.2 to 4.1.3
- Updated CHANGELOG with SSL cert fix as highlight
- Added *.img.zst.zip to .gitignore

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -80,3 +80,4 @@ tests/
 *.img.xz
 *.img.zst
 pishrink.sh
+*.img.zst.zip