Bump master version to 1.4.0-dev0

[TanYiQing]

• This contribution adheres to CONTRIBUTING.md.
• I've updated CHANGELOG.md if applicable.
• I've added tests applicable for this pull request

What does this Pull Request accomplish?

Bump version of master branch to 1.4.0-dev0.

Why should this Pull Request be merged?

Allow development for next version

What testing has been done?

N/A

[github-actions]

Test Results

    48 files  ±0      48 suites  ±0   1h 13m 13s ⏱️ -30s
 3 098 tests ±0   2 439 ✅ ±0     659 💤 ±0  0 ❌ ±0 
60 008 runs  ±0  47 730 ✅ ±0  12 278 💤 ±0  0 ❌ ±0 

Results for commit 23bbf36. ± Comparison against base commit fa2a2bb.

♻️ This comment has been updated with latest results.

[TanYiQing]

I made it a draft because pyproject.toml will be updated by publish.yml automatically. If the version in pyproject.toml is incorrect, I will use this PR to make the change.

[bkeryan]

I made it a draft because pyproject.toml will be updated by publish.yml automatically. If the version in pyproject.toml is incorrect, I will use this PR to make the change.

Releasing 1.3.0 will update pyproject.toml in releases/1.3, not in master.