Update igwn-auth-utils requirement

As of 0.3.0 igwn-auth-utils no longer has a [requests] extra, this MR closes igwn-auth-utils requirement is out-of-date (#22 - closed) by updating the requirement.

debian/control

@@ -11,10 +11,8 @@ Build-Depends:
  debhelper (>= 9),
  dh-python,
  python3-all,
- python3-igwn-auth-utils (>= 0.2.0),
+ python3-igwn-auth-utils (>= 0.3.1),
  python3-ligo-segments,
- python3-requests,
- python3-safe-netrc,
  python3-setuptools,
  help2man,
  python3-pytest (>= 2.8.0),
@@ -27,10 +25,8 @@ Architecture: all
 Depends:
  ${misc:Depends},
  ${python3:Depends},
- python3-igwn-auth-utils (>= 0.2.0),
+ python3-igwn-auth-utils (>= 0.3.1),
  python3-ligo-segments,
- python3-requests,
- python3-safe-netrc,
 Description: GW data discovery Python 3 library
  The DataFind service allows users to query for the location of
  Gravitational-Wave Frame (GWF) files containing data from the