piglit: upgrade to latest revision

piglit: upgrade to latest revision

Changelog:
  tests: Add test for GL_EXT_shader_clock
  tests: Add test for GL_EXT_shader_realtime_clock
  vulkan: Add cmat tests using constant as accumulator
  tests: test UBO and SSBO backed by the same buffer
  arb_direct_state_access: fix internaformat query behavior
  khr_texture_compression_astc: normalize error-color
  tests/util: provide simple array for cleanup handlers
  ext_external_objects: use piglit_set_destroy_func instead of atexit
  ext_external_objects: fix timeline semaphore validation error
  ext_external_objects: fix validation error with barriers
  ext_external_objects: fix validation error on cmdbuf usage
  ext_external_objects: fix validation error releasing resources
  ext_external_objects: fix validation error for cmdbuffer usage
  ext_external_objects: fix validation error with semaphore value
  arb_shading_language_420pack: test uniform block matching
  gl: test push pop attribute with color material
  GL_EXT_texture_integer: basic validation tests
  cmake: Fix mis-matching arguments warning
  fix invalid typecast

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>