[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/format.sh

@@ -6,10 +6,7 @@
 # shellcheck disable=SC1091
 . tools/cpm/common.sh
 
-# shellcheck disable=SC2086
-FILES=$(find $DIRS -maxdepth "$MAXDEPTH" -name cpmfile.json)
-
-for file in $FILES; do
+for file in $CPMFILES; do
     jq --indent 4 < "$file" > "$file".new
     mv "$file".new "$file"
 done