Restore execute bits on deactivate scripts (microsoft#23620)

microsoft#22921 removed executable bits:
```diff
diff --git a/pythonFiles/deactivate/bash/deactivate b/python_files/deactivate/bash/deactivate
old mode 100755
new mode 100644
similarity index 100%
rename from pythonFiles/deactivate/bash/deactivate
rename to python_files/deactivate/bash/deactivate
```


https://github.com/microsoft/vscode-python/pull/22921/files#diff-796809259ce3b33f54a33371e898048faf2f7f912cd1bbe11059feb40a63a58d

Set them back.


Fixes microsoft#23449 and microsoft#23195

Author: covracer