Prefer tr to ${char^^}, which does not work on older bash versions (#303)

* Prefer `tr` to ${char^^}, which does not work on older bash versions

* Update CHANGELOG.md

---------

Co-authored-by: ReFil <31960031+ReFil@users.noreply.github.com>

CHANGELOG.md

@@ -4,6 +4,8 @@ Here's all notable changes and commits to both the configuration repo and the ba
 Many thanks to all those who have submitted issues and pull requests to make this firmware better!
 ## Config repo
 
+12/27/2023 - Change how the characters are used in the versioning script for improved MacOS experience [#303](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/303)
+
 12/15/2022 - Update keymap.json to reflect new versioning macro [#300](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/300)
 
 12/15/2023 - Add PR template [#293](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/293)
@@ -38,7 +40,6 @@ Many thanks to all those who have submitted issues and pull requests to make thi
 
 3/4/2023 - Add extra keys into matrix that point to nowhere, fixes spurious keypress issues when using USB3.1 cables [#114](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/114) [#116](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/116)
 
-
 2/14/2023 - Disable ZMK logging by default to improve power consumption [#101](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/101)
 
 1/25/2023 - Fix automatic OS detection to build properly when using the local builder on OS-X [#91](https://github.com/KinesisCorporation/Adv360-Pro-ZMK/pull/91)

bin/get_version.sh

@@ -5,11 +5,18 @@ date=$(date -u +"%Y%m%d")
 branch=${1:-$(git rev-parse --abbrev-ref HEAD | cut -c1-4)}
 commit=${2:-$(git rev-parse --short HEAD)}
 
+uppercase_char() {
+    local char=$1
+
+    (echo $char | tr '[a-z]' '[A-Z]' 2> /dev/null) || echo "${char^^}"
+}
+
 # Function to transform characters to ZMK key behaviours
 transform_char() {
     local char=$1
+
     if [[ $char =~ [A-Za-z] ]]; then
-        echo "<&kp ${char^^}>, "
+        echo "<&kp $(uppercase_char $char)>, "
     elif [[ $char =~ [0-9] ]]; then
         echo "<&kp N${char}>, "
     elif [ "$char" = "." ]; then