dev: remove update-zig script (Wrench now does this)

Wrench now automatically sends PRs to update Zig:

* https://github.com/hexops/mach/pull/655
* https://github.com/hexops/mach-examples/pull/23

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

dev/update-zig.sh

@@ -1,34 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-cd "$(dirname "${BASH_SOURCE[0]}")"/..
-
-# the sed in macOS is pretty old so users
-# have to to use gsed which can be installed via homebrew
-if [[ "$OSTYPE" == "linux-gnu"* ]]; then
-    gsed=$(which sed)
-else
-    gsed=gsed
-fi
-
-update_zig() {
-    $gsed -i 's|\(Currently we test using\ \)`.*`|\1'"\`$1\`|" $2
-    $gsed -i 's|\(https://ziglang.org/builds/zig-[^/ -]*-[^/ -]*-\)[^/ ]*\(\(\.tar\.xz\)[^/ ]*\)|\1'"$1"'\2|' $2
-    $gsed -i 's|\(https://ziglang.org/builds/zig-[^/ -]*-[^/ -]*-\)[^/ ]*\(\(\.zip\)[^/ ]*\)|\1'"$1"'\2|' $2
-    $gsed -i 's|\(C:\\zig-[^/ -]*-[^/ -]*-\)[^/ \\]*|\1'"$1|" $2
-}
-
-if [ -n "${ZIG_VERSION:-}" ]; then
-    version="${ZIG_VERSION:-}"
-    
-    update_zig "$version" README.md
-    
-    sources=$(find . | grep './.github/workflows' | grep -v 'third_party/' | grep -v 'DirectXShaderCompiler' | grep '\.yml')
-    echo "$sources" | while read line ; do update_zig "$version" "$line" ; done
-
-    # If running inside mach-examples/libs/mach, also update the mach-examples repo.
-    sources=$(find ../../.github/ | grep '/workflows/' | grep '\.yml')
-    echo "$sources" | while read line ; do update_zig "$version" "$line" ; done
-else
-    echo "must specify e.g. ZIG_VERSION=0.10.0-dev.2017+a0a2ce92c"
-    exit 0
-fi