chore(3p/nixpkgs): Bump nixpkgs channels to 2021-08-04 r/2710

I used //tools/depot-nixpkgs-update for this - thanks again, sterni!

Included fixes:

* temporary workaround for building notmuch python package, fixed in
  upstream already (but channel hasn't advanced there)
* Disable fprintd in grfn.system.yeren, as the fprintd-tod package
  currently has a version mismatch in nixpkgs

Co-authored-by: Griffin Smith <grfn@gws.fyi>
Change-Id: If6d71b08ace9db57daadfe3b69b9cd4aec6a5a4e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3274
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

0 files changed, 0 insertions, 0 deletions