Updated Guava and javax.servlet dependencies

[keinhaar]

• Removed the included 2 guava libraries and replaced them by an dependency to the bundle com.google.guava which is included in eclipse anyway.
• replaced the javax.servlet dependency by jakarta.servlet-api, which is included since 2021-06.

[protoism]

Hi @keinhaar,
this PR seems interesting, but I wonder how safe is using Eclipse's guava.
I wonder if we introduce a dependency between the version we need, and the version eclipse distributes.
Moreover, we're "exporting" guava. What does it mean?

About servlet APIs... the proposed fix is already in main, isn't it?

So... at the very least the PR must be re-done (best thing to do in my opinion is back merging main branch to your branch and make a manual merge)

Let me know!