build: bump required log version

else logging using "{var}" in format strings doesn't work properly.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

debian/control

@@ -30,7 +30,7 @@ Build-Depends: debhelper (>= 12),
  librust-hyper-0.14+full-dev (>= 0.14.5-~~),
  librust-lazy-static-1+default-dev (>= 1.4-~~),
  librust-libc-0.2+default-dev,
- librust-log-0.4+default-dev,
+ librust-log-0.4.17+default-dev,
  librust-nix-0.19+default-dev (>= 0.19.1-~~),
  librust-nom-5+default-dev (>= 5.1-~~),
  librust-num-traits-0.2+default-dev,