Fix path git_cache (#254)

Author: avdivan

.github/workflows/OCV-PR-Linux.yaml

@@ -91,7 +91,7 @@ jobs:
         # - /mnt/cache/binaries_cache:/opt/binaries_cache
         # - vol_dnn_models:/opt/dnn-models
         # NOTE: CN config
-        - /home/opencv-cn/git_cache/${{ matrix.version }}:/opt/git_cache
+        - /home/opencv-cn/git_cache/:/opt/git_cache
         - /home/opencv-cn/ci_cache/opencv/${{ matrix.version }}:/opt/.ccache
         - /home/opencv-cn/binaries_cache/${{ matrix.version }}:/opt/binaries_cache
         - /home/opencv-cn/dnn-models:/opt/dnn-models