[cmake, tools, docs] Update CPMUtil (#2790)

updates CPMUtil to
[`8f9b39fc98`](https://git.crueter.xyz/CMake/CPMUtil/commit/8f9b39fc980fc7079c7c4471c19f219180abe368)

Makes the tooling/docs better and enforces usage of tar.gz everywhere as
opposed to zips

Signed-off-by: crueter <crueter@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2790
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

tools/cpm/check-updates-all.sh

@@ -1,4 +1,4 @@
-#!/bin/bash -e
+#!/bin/sh -e
 
 # SPDX-FileCopyrightText: 2025 crueter
 # SPDX-License-Identifier: GPL-3.0-or-later
@@ -7,4 +7,4 @@
 . tools/cpm/common.sh
 
 # shellcheck disable=SC2086
-tools/cpm/check-updates.sh $LIBS
+tools/cpm/check-updates.sh "$@" $LIBS