[orca/wip/kalev/python3.10] Fix compatibility with Python 3.10

[Kalev Lember <klember src gnome org>]

commit 5ae6ba625b5262780f3d4fea3da363af7a0b01cb
Author: Kalev Lember <klember redhat com>
Date:   Fri Sep 10 10:12:23 2021 +0200

    Fix compatibility with Python 3.10
    
    Python 3.10 removed aliases to Collections Abstract Base Classes that
    were deprecated in Python 3.3.
    
    Fix this by just using collections.abc directly without using the alias.
    
    https://docs.python.org/3.10/whatsnew/changelog.html#python-3-10-0-alpha-5

 src/orca/generator.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/orca/generator.py b/src/orca/generator.py
index e98970992..e9a9d89de 100644
--- a/src/orca/generator.py
+++ b/src/orca/generator.py
@@ -78,7 +78,7 @@ class Generator:
         self._activeProgressBars = {}
         self._methodsDict = {}
         for method in \
-            [z for z in [getattr(self, y).__get__(self, self.__class__) for y in [x for x in dir(self) if 
x.startswith(METHOD_PREFIX)]] if isinstance(z, collections.Callable)]:
+            [z for z in [getattr(self, y).__get__(self, self.__class__) for y in [x for x in dir(self) if 
x.startswith(METHOD_PREFIX)]] if isinstance(z, collections.abc.Callable)]:
             name = method.__name__[len(METHOD_PREFIX):]
             name = name[0].lower() + name[1:]
             self._methodsDict[name] = method