fix: use upgraded Atmosphere version for Push

[denis-anisimov]

fixes #10103

[caalador]

Reconnect websocket tests fail seemingly not getting the connection before timeout.

[caalador]

The rebase/merge from master failed somehow as now I see files and changes for everything and the PR is suddenly +1,423 −530

[vaadin-bot]

SonarQube analysis reported 31 issues

• 31 info

Top 10 extra issues

Note: The following issues were found on lines that were not modified in the pull request. Because these issues can't be reported as line comments, they are summarized here:

1. Constants.java#L43: Do not forget to remove this deprecated code someday.
2. Constants.java#L62: Do not forget to remove this deprecated code someday.
3. Constants.java#L69: Do not forget to remove this deprecated code someday.
4. Constants.java#L77: Do not forget to remove this deprecated code someday.
5. Constants.java#L84: Do not forget to remove this deprecated code someday.
6. Constants.java#L91: Do not forget to remove this deprecated code someday.
7. Constants.java#L99: Do not forget to remove this deprecated code someday.
8. Constants.java#L107: Do not forget to remove this deprecated code someday.
9. Constants.java#L115: Do not forget to remove this deprecated code someday.
10. Constants.java#L123: Do not forget to remove this deprecated code someday.

[denis-anisimov]

2.7.0 either has a regression or requires changes in vaadin atmosphere client engine code.

[vaadin-bot]

Hi @denis-anisimov , this commit cannot be picked to 6.0 by this bot, can you take a look and pick it manually?
Error Message: Error: Command failed: git cherry-pick 1581635
fatal: bad object 1581635

[ZheSun88]

looks like this PR has been closed without merging.. so no cherry picks