Remove jetty, bump spring version

[ChesterEcwid]

This pull request updates the project dependencies and versions, primarily focusing on upgrading the Spring framework, removing Jetty dependencies, and cleaning up related test code. The most significant changes are the removal of Jetty from the build and tests, and the upgrade to Spring 7.0.6 across all modules.

Dependency and Version Upgrades:

• Upgraded the project version to 1.2-ecwid-29 in pom.xml, core/pom.xml, and generator/pom.xml. [1] [2] [3] [4]
• Upgraded Spring framework version to 7.0.6 in all relevant POM files. [1] [2] [3]

Jetty Removal:

• Removed Jetty dependencies (jetty-server, jetty-servlet, jetty-webapp) from core/pom.xml.
• Removed the APIServletTest.java test class, which relied on Jetty for server testing, from the codebase.

Other Dependency Changes:

• Added commons-lang version 2.6 as a dependency in generator/pom.xml.

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