workflows: update linux source tgz file version.

[cfc4n]

error output:

Reading state information...
E: Unable to locate package linux-source-6.8.0
E: Couldn't find any package by glob 'linux-source-6.8.0' E: Couldn't find any package by regex 'linux-source-6.8.0' Error: Process completed with exit code 100.

Github Action run failed via : https://github.com/gojue/ecapture/actions/runs/11101523778/job/30839371311?pr=642#step:3:48