fix tests on mac os

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

Author: arthurzam

.github/workflows/test.yml

@@ -62,7 +62,7 @@ jobs:
       run: |
         brew install bash gnu-sed
         # enable gnu-sed usage as "sed"
-        echo "/usr/local/opt/gnu-sed/libexec/gnubin" >> $GITHUB_PATH
+        echo "$(brew --prefix gnu-sed)/libexec/gnubin" >> $GITHUB_PATH
 
     - name: Install dependencies
       run: |