Fix master branch version from 3.4.1-SNAPSHOT to 3.5.0-SNAPSHOT

The reference environments like https://folio-snapshot.dev.folio.org/ should be built using the latest master branch version of all repositories.

This is implemented by using the latest SNAPSHOT version.

This only works if

• the master branch uses the next minor version: 3.5.0-SNAPSHOT, and

• the b3.4 branch uses the next patch version: 3.4.1-SNAPSHOT.

See

https://folio-project.slack.com/archives/C210RP0T1/p1741274898916269
https://folio-project.slack.com/archives/C210RP0T1/p1741816909580189
https://dev.folio.org/guidelines/release-procedures/#maven-based-modules

Currently the master branch incorrectly uses 3.4.1-SNAPSHOT so that a commit to the b3.4 branch ends up in there reference environment. This is not wanted.

Solution: Change the master branch version to 3.5.0-SNAPSHOT.