mpv-fourier pkgrel=4: outrank stock arch's pkgrel=3 so replaces= triggers on -Syu

Stock arch ships mpv 1:0.41.0-3. Our 1:0.41.0-2 is OLDER per vercmp, so
pacman -Syu refuses to apply replaces=mpv (no auto-downgrade across the
replaces relation). Bump to pkgrel=4 to win the comparison.

Going forward: when stock arch bumps mpv pkgrel, mpv-fourier needs a
matching bump.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

arch/mpv-fourier/PKGBUILD

@@ -23,7 +23,7 @@ pkgname=mpv-fourier
 _upstreampkg=mpv
 epoch=1
 pkgver=0.41.0
-pkgrel=2
+pkgrel=4
 pkgdesc='mpv with fourier-umbrella patches (vo_dmabuf_wayland plane-semantics fix slot)'
 arch=('aarch64')
 url='https://mpv.io/'