Upgrade sqlalchemy to 1.2.18

[fabaff]

Description:

Changelog: https://docs.sqlalchemy.org/en/latest/changelog/changelog_12.html#change-1.2.18

Example entry for configuration.yaml (if applicable):

recoder:

sensor:
  - platform: sql
    queries:
      - name: Sun state
        query: "SELECT * FROM states WHERE entity_id = 'sun.sun' ORDER BY state_id DESC LIMIT 1;"
        column: 'state'

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

If the code communicates with devices, web services, or third-party tools:

• New dependencies have been added to the REQUIREMENTS variable (example).
• New or updated dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.