virtual/blas: Rise eigen version in deps

Package-Manager: portage-2.2.0_alpha161
Merge branch 'master' of github.com:gentoo-science/sci

# By Jauhien Piatlicki (jauhien)
# Via Jauhien Piatlicki (jauhien) (1) and Sébastien Fabbro (1)
* 'master' of github.com:gentoo-science/sci:
  sci-physics/herwig++: version bump
  sci-physics/thepeg: version bump