Update rt-tests

[bssrikanth]

Update rt-tests to avoid install failures.

Before fix:

  -> Source is https://www.kernel.org/pub/linux/utils/rt-tests/rt-tests-2.7.tar.gz
  -> Downloading rt-tests-2.7.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0  1946    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404
==> ERROR: Failure while downloading rt-tests-2.7.tar.gz
    Aborting...
Install hackbench failed

After fix:

  -> Source is https://www.kernel.org/pub/linux/utils/rt-tests/rt-tests-2.8.tar.gz
  -> Downloading rt-tests-2.8.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  152k  100  152k    0     0   118k      0  0:00:01  0:00:01 --:--:--  118k
==> WARNING: Skipping verification of source file PGP signatures.
==> Validating source files with sha256sums...
    rt-tests-2.8.tar.gz ... Skipped
==> Extracting sources...
  -> Source is https://www.kernel.org/pub/linux/utils/rt-tests/rt-tests-2.8.tar.gz
  -> Extracting rt-tests-2.8.tar.gz with bsdtar
==> Starting patch_source()...
..
Setting up hackbench-lkp (2024-12-11) ...
install succeed

[rli9]

thanks for the patch