Upgrade lib to have fix for PipeOutput deadlock (#615)

PR on the other side: https://github.com/sourcegraph/sourcegraph/pull/24654

Author: mrnugget

go.mod

@@ -22,7 +22,7 @@ require (
 	github.com/sourcegraph/batch-change-utils v0.0.0-20210708162152-c9f35b905d94
 	github.com/sourcegraph/go-diff v0.6.1
 	github.com/sourcegraph/jsonx v0.0.0-20200629203448-1a936bd500cf
-	github.com/sourcegraph/sourcegraph/lib v0.0.0-20210906124104-d18be6b57521
+	github.com/sourcegraph/sourcegraph/lib v0.0.0-20210907041800-ae0266126192
 	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	golang.org/x/net v0.0.0-20210614182718-04defd469f4e

go.sum

@@ -261,8 +261,8 @@ github.com/sourcegraph/go-diff v0.6.1 h1:hmA1LzxW0n1c3Q4YbrFgg4P99GSnebYa3x8gr0H
 github.com/sourcegraph/go-diff v0.6.1/go.mod h1:iBszgVvyxdc8SFZ7gm69go2KDdt3ag071iBaWPF6cjs=
 github.com/sourcegraph/jsonx v0.0.0-20200629203448-1a936bd500cf h1:oAdWFqhStsWiiMP/vkkHiMXqFXzl1XfUNOdxKJbd6bI=
 github.com/sourcegraph/jsonx v0.0.0-20200629203448-1a936bd500cf/go.mod h1:ppFaPm6kpcHnZGqQTFhUIAQRIEhdQDWP1PCv4/ON354=
-github.com/sourcegraph/sourcegraph/lib v0.0.0-20210906124104-d18be6b57521 h1:buaBM1YCjWt6+DlXESM5EAmZ+SvlUteXpnyQmGa07HA=
-github.com/sourcegraph/sourcegraph/lib v0.0.0-20210906124104-d18be6b57521/go.mod h1:ZK8mHKWdapYI8iIQwsO7QUxf44RjiNGKkOZa9aYIjTc=
+github.com/sourcegraph/sourcegraph/lib v0.0.0-20210907041800-ae0266126192 h1:/OdZqWVKxON/1/J6a/cw2kZJtRNpampaFekn0Gnzefg=
+github.com/sourcegraph/sourcegraph/lib v0.0.0-20210907041800-ae0266126192/go.mod h1:ZK8mHKWdapYI8iIQwsO7QUxf44RjiNGKkOZa9aYIjTc=
 github.com/sourcegraph/yaml v1.0.1-0.20200714132230-56936252f152 h1:z/MpntplPaW6QW95pzcAR/72Z5TWDyDnSo0EOcyij9o=
 github.com/sourcegraph/yaml v1.0.1-0.20200714132230-56936252f152/go.mod h1:GIjDIg/heH5DOkXY3YJ/wNhfHsQHoXGjl8G8amsYQ1I=
 github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=

internal/batches/executor/run_steps.go

@@ -327,7 +327,7 @@ func executeSingleStep(
 	stderr := io.MultiWriter(&stderrBuffer, uiStderrWriter, opts.logger.PrefixWriter("stderr"))
 
 	// Setup readers that pipe the output into the given buffers
-	wg, err := process.PipeOutput(cmd, stdout, stderr)
+	wg, err := process.PipeOutput(ctx, cmd, stdout, stderr)
 	if err != nil {
 		return bytes.Buffer{}, bytes.Buffer{}, errors.Wrap(err, "piping process output")
 	}