fix env path on windows

use native shells' env var syntax

Author: 2bndy5

action.yml

@@ -271,7 +271,7 @@ runs:
         clang-tools -i ${{ inputs.version }} -b
 
         # Install color output requirements if enabled
-        case "${{ env.CPP_LINTER_COLOR }}" in
+        case "$CPP_LINTER_COLOR" in
             "true" | "on" | "1")
                 pip install -r "$GITHUB_ACTION_PATH/color-requirements.txt"
                 ;;
@@ -318,9 +318,9 @@ runs:
 
         # Install color output requirements if enabled
         $colorEnabled = "true","on","1"
-        if ( $colorEnabled.contains("${{ env.CPP_LINTER_COLOR }}") )
+        if ( $colorEnabled.contains("$env:CPP_LINTER_COLOR") )
         {
-            pip install -r "$GITHUB_ACTION_PATH/color-requirements.txt"
+            pip install -r "$env:GITHUB_ACTION_PATH/color-requirements.txt"
         }
 
     - name: Run cpp-linter (Windows)