Update tests.yml

.github/workflows/tests.yml

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5b2a8ca..115a1ba 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -54,7 +54,7 @@
 
       - name: Unit tests
         shell: cmd
-        working-directory: tests\unit_tests
+        working-directory: tests/unit_tests
         run: ./test.bat --toolset=msc
 
   # ---------- Windows (clang-cl) ----------
@@ -75,7 +75,7 @@
 
       - name: Unit tests (clang-cl)
         shell: cmd
-        working-directory: tests\unit_tests
+        working-directory: tests/unit_tests
         run: ./test.bat
 
   # ---------- macOS ----------