Extend unittest-nxp-neutron job duration to 120 minutes.

The job was killed after 90 minutes. Tested 2 times, the timeout triggered during completely different tests and timestamps suggest that nothing froze. Seems like the added `convolution` tests just increased the duration of the job to over 90 minutes.

Author: MartinPavella

.github/workflows/pull.yml

@@ -1400,7 +1400,7 @@ jobs:
       docker-image: ci-image:executorch-ubuntu-22.04-clang12
       submodules: 'recursive'
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
-      timeout: 90
+      timeout: 120
       script: |
         set -eux