Update herdr to 0.9.1 with Zig 0.16.0 for the vendored libghostty-vt (#493)

Upstream 0.9.1 bumps vendored libghostty-vt's minimum_zig_version to
0.16.0, so the pinned Zig tarballs move from 0.15.2 to 0.16.0 with
checksums taken from ziglang.org's download index.

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

pkgbuilds/herdr/PKGBUILD

@@ -1,7 +1,7 @@
 # Maintainer: David Heinemeier Hansson <david@hey.com>
 
 pkgname=herdr
-pkgver=0.9.0
+pkgver=0.9.1
 pkgrel=1
 pkgdesc="Herdr terminal workspace manager for AI coding agents"
 arch=('x86_64' 'aarch64')
@@ -13,13 +13,13 @@ replaces=('omarchy-herdr')
 conflicts=('omarchy-herdr')
 options=('!debug' '!lto')
 
-_zigver=0.15.2
+_zigver=0.16.0
 source=("herdr-$pkgver.tar.gz::$url/archive/refs/tags/v$pkgver.tar.gz")
 source_x86_64=("zig-x86_64-linux-$_zigver.tar.xz::https://ziglang.org/download/$_zigver/zig-x86_64-linux-$_zigver.tar.xz")
 source_aarch64=("zig-aarch64-linux-$_zigver.tar.xz::https://ziglang.org/download/$_zigver/zig-aarch64-linux-$_zigver.tar.xz")
-sha256sums=('1e83bff4b05834ed8281e16f1680e8f3e58375a94b2e3f2b3d021e28e293ef9a')
+sha256sums=('03403d3ef80dcf2b954dd5d27eb636e6c4f5279d240b48de272b7f53e4b73093')
-sha256sums_x86_64=('02aa270f183da276e5b5920b1dac44a63f1a49e55050ebde3aecc9eb82f93239')
+sha256sums_x86_64=('70e49664a74374b48b51e6f3fdfbf437f6395d42509050588bd49abe52ba3d00')
-sha256sums_aarch64=('958ed7d1e00d0ea76590d27666efbf7a932281b3d7ba0c6b01b0ff26498f667f')
+sha256sums_aarch64=('ea4b09bfb22ec6f6c6ceac57ab63efb6b46e17ab08d21f69f3a48b38e1534f17')
 
 prepare() {
   cd "herdr-$pkgver"