app-portage/portage-utils: version bump to v0.81

app-portage/portage-utils: version bump to v0.81

- 697094: qfile incorrectly matching /usr/lib
- 697068: qlop -r not showing ongoing merges from parallel merges
- 696078: qgrep not matching revisioned ebuilds
- 695586: qpkg double frees and incorrect unpacking
- 694972: qlop -r/-a speedups
- 692224: qlop support for alternate ROOT
- 677982: qfile report matches from prune lib registry

Closes: https://bugs.gentoo.org/697094
Closes: https://bugs.gentoo.org/697068
Closes: https://bugs.gentoo.org/696078
Closes: https://bugs.gentoo.org/695586
Closes: https://bugs.gentoo.org/694972
Closes: https://bugs.gentoo.org/692224
Closes: https://bugs.gentoo.org/677982
Package-Manager: Portage-2.3.76, Repoman-2.3.16
Signed-off-by: Fabian Groffen <grobian@gentoo.org>