M-export: bump RENDER_CACHE_VERSION for the XYB JPEG XL decode fix

PR #780 changes how lossy (XYB) wide-gamut JPEG XL files decode (crates/codecs/src/jxl.rs), so cached renders of those photos are stale.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BKWB9TCnvzJHV6xMLAj2J4

crates/engine/src/media.rs

@@ -62,7 +62,7 @@ impl SettingsHashes {
 }
 
 /// Bump when the pipeline's output changes, to invalidate cached thumbnails.
-pub const RENDER_CACHE_VERSION: u64 = 60;
+pub const RENDER_CACHE_VERSION: u64 = 61;
 
 /// Thumbnails render at one of these long edges (so window/cell size changes reuse the cache).
 pub const THUMB_SIZES: [usize; 4] = [128, 256, 384, 512];