upgrade teerex

[brenzi]

to include latest security fixes

[brenzi]

do integritee-network/pallet-teerex#54 first

[mosonyi]

@haerdib please clarify with @brenzi

[haerdib]

@brenzi - which secruity issues should be fixed here?

[brenzi]

They have been fixed by Edith. we just need to upgrade to teerex master. that's all