Update CI on Ubuntu to tcl8.6 (since 20.04 is now used) (#8460)
Github started shifting some repositoreis to use ubuntu 20.04 by default tcl8.5 is missing in these, but 8.6 exists in both 20.04 and 18.04
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Github started shifting some repositoreis to use ubuntu 20.04 by default tcl8.5 is missing in these, but 8.6 exists in both 20.04 and 18.04