ptest-runner: Upgrade 2.5.0 -> 2.5.1

Pull in buffering fix:

"""
When running slow ptests, we can see an issue where the tests are writing output
but it doesn't make it to the process (e.g. ssh connection) running ptest-runner.

The issue is that the standard buffering for non-interactive terminals is 8kb and
some ptests don't output enough data to trigger a write. This can lead to
the controlling connection timing out.

This change forces the output streams to be line buffered in all cases. Most
ptest output would contain newlines so this should work well. stderr can be
unbuffered by default but making it consistent here seems the best approach.

Testing with this change on slow ptest runs (e.g. qemu emulated) showed much
more consistent data with this change.
"""

(From OE-Core rev: b969018b72abd96e4b504a23cb7054db4f661761)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b57105311f1c5fd879dd58fa1de8862ebad989c1)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

meta/recipes-support/ptest-runner/ptest-runner_2.5.1.bb

@@ -7,7 +7,7 @@ HOMEPAGE = "http://git.yoctoproject.org/cgit/cgit.cgi/ptest-runner2/about/"
 LICENSE = "GPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=751419260aa954499f7abaabaa882bbe"
 
-SRCREV = "7429fdd52abb5b08a9e8acef14b1bc4604f09c8f"
+SRCREV = "afe64efbb3f028e898fa9a5efcdc3010ebdf283c"
 
 SRC_URI = "git://git.yoctoproject.org/ptest-runner2;branch=master;protocol=https \
 "