gh-158237: Don't insert space before attribute access on bool constants

[Tony123-tech]

Lib/_ast_unparse.py's visit_Attribute inserts a space before the "."
when node.value is an int literal, to avoid the syntax error in
3.abs(). But bool is a subclass of int, so True.real and
False.class also get the space:

>>> import ast
>>> ast.unparse(ast.parse("x = True.real"))
'x = True .real'
>>> ast.unparse(ast.parse("x = False.__class__"))
'x = False .__class__'

True.real and False.class are valid without a space, so the
output is not idiomatic. The fix excludes bool from the isinstance
check.

• Issue: ast.unparse: don't insert space before attribute access on bool constants #158237

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