Update Black's target-version to py37

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### Description
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Black's `target-version` was still set to `['py27', 'py36']`. Set it to `[py37]` instead.

Also update Black and other pre-commit hooks and re-format with Black.

### Checklist
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This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [ ] A short code fix
	- please include the issue number, and create an issue if none exists, which
	  must include a complete example of the issue.  one line code fixes without an
	  issue and demonstration will not be accepted.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.   one line code fixes without tests will not be accepted.
- [ ] A new feature implementation
	- please include the issue number, and create an issue if none exists, which must
	  include a complete example of how the feature would look.
	- Please include: `Fixes: #<issue number>` in the commit message
	- please include tests.

**Have a nice day!**

Closes: #7536
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/7536
Pull-request-sha: b3aedf5570d7e0ba6c354e5989835260d0591b08

Change-Id: I8be85636fd2c9449b07a8626050c8bd35bd119d5

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/sqlalchemy/orm/attributes.py b/lib/sqlalchemy/orm/attributes.py
index dce008a67..09d45bef7 100644
--- a/lib/sqlalchemy/orm/attributes.py
+++ b/lib/sqlalchemy/orm/attributes.py
@@ -701,7 +701,7 @@ class AttributeImpl:
         load_on_unexpire=True,
         send_modified_events=True,
         accepts_scalar_loader=None,
-        **kwargs
+        **kwargs,
     ):
         r"""Construct an AttributeImpl.
 
@@ -1318,7 +1318,7 @@ class CollectionAttributeImpl(AttributeImpl):
         trackparent=False,
         copy_function=None,
         compare_function=None,
-        **kwargs
+        **kwargs,
     ):
         super(CollectionAttributeImpl, self).__init__(
             class_,
@@ -1327,7 +1327,7 @@ class CollectionAttributeImpl(AttributeImpl):
             dispatch,
             trackparent=trackparent,
             compare_function=compare_function,
-            **kwargs
+            **kwargs,
         )
 
         if copy_function is None:
@@ -2081,7 +2081,7 @@ def register_attribute_impl(
     useobject=False,
     impl_class=None,
     backref=None,
-    **kw
+    **kw,
 ):
 
     manager = manager_of_class(class_)