deps: upgrade to github.com/rogpeppe/go-internal v1.6.1

v1.6.1 has relaxed the constraint on testscript.Params.UpdateScripts as
follows:

> UpdateScripts specifies that if a `cmp` command fails and its second
argument refers to a file inside the testscript file, the command will
succeed and the testscript file will be updated to reflect the actual
content (which could be stdout, stderr or a real file).

This means the -update flag for testscript tests is now useful in
situation where cmp is used to compare generated files with golden
files, e.g. the case of cue get go.

Change-Id: Ia4a713058148c61fee7c9196acedc09d36da85a9
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/6841
Reviewed-by: CUE cueckoo <cueckoo@gmail.com>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>

go.mod

@@ -10,7 +10,7 @@ require (
 	github.com/lib/pq v1.0.0 // indirect
 	github.com/mpvl/unique v0.0.0-20150818121801-cbe035fff7de
 	github.com/pkg/errors v0.8.1 // indirect
-	github.com/rogpeppe/go-internal v1.6.0
+	github.com/rogpeppe/go-internal v1.6.1
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.3
 	github.com/stretchr/testify v1.2.2

go.sum

@@ -90,8 +90,8 @@ github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R
 github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6SoW27p1b0cqNHllgS5HIMJraePCO15w5zCzIWYg=
-github.com/rogpeppe/go-internal v1.6.0 h1:IZRgg4sfrDH7nsAD1Y/Nwj+GzIfEwpJSLjCaNC3SbsI=
-github.com/rogpeppe/go-internal v1.6.0/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
+github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
+github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=