Upgrade Spring to the latest version

[cardillan]

We need to get to a newer Spring version. The goal is to build and run Mindcode on Java 22, which is not supported by the current version of Spring.

What needs to be working:

• Building, running, debugging and unit testing in Intellij IDEA.
• Building and unit testing from the command line.
• Building by GitHub actions
• Building/deploying on Heroku.