Remove jupyter-server-terminal cap and fix release script

[akchinSTC]

Signed-off-by: Alan Chin [email protected]

• Terminals are broken in the 3.14 release. Removing the cap on jupyter-server-terminals resolves the problem but results in error in list of installed server extensions , issue open here Jupyter-server-terminals python package fails to list properly  #3058.
• small release script fixes

What changes were proposed in this pull request?

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[ptitzler]

LGTM! Terminal appears to be working again. Would be nice to add a comment to the Makefile indicating that the command is expected to fail, referencing the issue you've created.