linux-purism-librem5: upgrade to 5.18.11 (MR 3407)

[ci:skip-build]: already built successfully in CI

device/main/linux-purism-librem5/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer:  Clayton Craft <clayton@craftyguy.net>
 # Co-Maintainer: Bhushan Shah <bshah@kde.org>
 pkgname=linux-purism-librem5
-pkgver=5.18.5
+pkgver=5.18.11
 pkgrel=0
 _purismrel=1
 # <kernel ver>.<purism kernel release>
@@ -79,7 +79,7 @@ dev() {
 		INSTALL_HDR_PATH="$subpkgdir"/usr
 }
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