Bump Acts to v8.1.0

Vincent Pascuzzirequested to merge
update-atlasexternals-Acts_v7.0.0 into master

Acts tag v7.0.0 is expected to contain the frozen API.

Edit 2: Changed to v8.1.0.

Edit 1: Changed to v8.0.0 as per the json requirements from the ATLAS side (see discussion below).

FYI: @jchapman, @asalzbur, @pagessin, @corentin

Edited by Vincent Pascuzzi

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