Bump transaction from 2.4.0 to 3.0.0

Bumps [transaction](https://github.com/zopefoundation/transaction) from 2.4.0 to 3.0.0.
- [Release notes](https://github.com/zopefoundation/transaction/releases)
- [Changelog](https://github.com/zopefoundation/transaction/blob/master/CHANGES.rst)
- [Commits](zopefoundation/transaction@2.4.0...3.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -28,7 +28,7 @@ repoze.lru==0.7
 repoze.sendmail==4.4.1
 requests==2.22.0
 simplejson==3.17.0
-transaction==2.4.0
+transaction==3.0.0
 translationstring==1.3
 ujson==1.35
 urllib3==1.25.7