Fix mypy linting issues

### Description

Fixing mypy linting issues for new mypy version.

### Checklist

This pull request is:

- [ ] A documentation / typographical error fix
	- Good to go, no issue or tests are needed
- [x] 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: #1564
Pull-request: sqlalchemy/alembic#1564
Pull-request-sha: a79d47d3acf7ae628ead7ca829bfe1c6f864c3c9

Change-Id: I3be88b6328dc07c46e6b1ddf8c85480dc88cfe95

alembic/ddl/base.py

@@ -175,7 +175,7 @@ def __init__(
         self.comment = comment
 
 
-@compiles(RenameTable)  # type: ignore[misc]
+@compiles(RenameTable)
 def visit_rename_table(
     element: RenameTable, compiler: DDLCompiler, **kw
 ) -> str:
@@ -185,23 +185,23 @@ def visit_rename_table(
     )
 
 
-@compiles(AddColumn)  # type: ignore[misc]
+@compiles(AddColumn)
 def visit_add_column(element: AddColumn, compiler: DDLCompiler, **kw) -> str:
     return "%s %s" % (
         alter_table(compiler, element.table_name, element.schema),
         add_column(compiler, element.column, **kw),
     )
 
 
-@compiles(DropColumn)  # type: ignore[misc]
+@compiles(DropColumn)
 def visit_drop_column(element: DropColumn, compiler: DDLCompiler, **kw) -> str:
     return "%s %s" % (
         alter_table(compiler, element.table_name, element.schema),
         drop_column(compiler, element.column.name, **kw),
     )
 
 
-@compiles(ColumnNullable)  # type: ignore[misc]
+@compiles(ColumnNullable)
 def visit_column_nullable(
     element: ColumnNullable, compiler: DDLCompiler, **kw
 ) -> str:
@@ -212,7 +212,7 @@ def visit_column_nullable(
     )
 
 
-@compiles(ColumnType)  # type: ignore[misc]
+@compiles(ColumnType)
 def visit_column_type(element: ColumnType, compiler: DDLCompiler, **kw) -> str:
     return "%s %s %s" % (
         alter_table(compiler, element.table_name, element.schema),
@@ -221,7 +221,7 @@ def visit_column_type(element: ColumnType, compiler: DDLCompiler, **kw) -> str:
     )
 
 
-@compiles(ColumnName)  # type: ignore[misc]
+@compiles(ColumnName)
 def visit_column_name(element: ColumnName, compiler: DDLCompiler, **kw) -> str:
     return "%s RENAME %s TO %s" % (
         alter_table(compiler, element.table_name, element.schema),
@@ -230,7 +230,7 @@ def visit_column_name(element: ColumnName, compiler: DDLCompiler, **kw) -> str:
     )
 
 
-@compiles(ColumnDefault)  # type: ignore[misc]
+@compiles(ColumnDefault)
 def visit_column_default(
     element: ColumnDefault, compiler: DDLCompiler, **kw
 ) -> str:
@@ -245,7 +245,7 @@ def visit_column_default(
     )
 
 
-@compiles(ComputedColumnDefault)  # type: ignore[misc]
+@compiles(ComputedColumnDefault)
 def visit_computed_column(
     element: ComputedColumnDefault, compiler: DDLCompiler, **kw
 ):
@@ -255,7 +255,7 @@ def visit_computed_column(
     )
 
 
-@compiles(IdentityColumnDefault)  # type: ignore[misc]
+@compiles(IdentityColumnDefault)
 def visit_identity_column(
     element: IdentityColumnDefault, compiler: DDLCompiler, **kw
 ):