Fixes the following warnings when running the release script:
```
Publish release v1.142.0rc3 on GitHub? [Y/n]:
/home/work/code/synapse/./scripts-dev/release.py:452: DeprecationWarning: Use name instead
if release.title == tag_name:
/home/work/code/synapse/./scripts-dev/release.py:457: DeprecationWarning: Use name instead
assert release.title == tag_name
/home/work/code/synapse/./scripts-dev/release.py:464: DeprecationWarning: Use name instead
name=release.title,
```