fix(optimistic_locking): fix version update on model decrement

[ali-essam]

Pull Request check-list

Please make sure to review and check all of these items:

• [y] Does npm run test or npm run test-DIALECT pass with this change (including linting)?
• [y] Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• [y] Have you added new tests to prevent regressions?
• [n] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• [y] Did you follow the commit message conventions explained in CONTRIBUTING.md?

Description of change

Using decrement on model should increment the version instead of decrementing it

Note: Some unrelated tests were failing locally before the changes

[codecov]

Codecov Report

Merging #8593 into master will increase coverage by 0.01%.
The diff coverage is 100%.