escape single quotes in postgresql nextval() identifier rendering

escape single quotes in postgresql nextval() identifier rendering

Fixed bug in the PostgreSQL dialect where a single quote in a sequence,
table, or schema name, such as one supplied via a ``schema_translate_map``
or an explicit :class:`.Sequence`, could result in a malformed
``nextval()`` statement. The quote is now properly escaped. Pull request
courtesy dxbjavid.

Fixes: #13429
Closes: #13430
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/13430
Pull-request-sha: 0c19bcbd85c69b492542c43a693600595cbd0916

Change-Id: I6198d491a8ead7429fb5ac70e0502a6644f06810