kernel-build: set pahole to v1.28 (kernel-patches#325)

We'll revert back to master after [1] is landed.

[1] https://lore.kernel.org/dwarves/20250110023138.659519-1-ihor.solodrai@pm.me/

Author: theihor

.github/workflows/kernel-build.yml

@@ -95,7 +95,7 @@ jobs:
         with:
           arch: ${{ inputs.arch }}
           llvm-version: ${{ inputs.llvm-version }}
-          pahole: master
+          pahole: 1cb4202ed2cbd591734f6b7fb1d2b8aa8eb5a1c3 # v1.28
       - name: Print toolchain version used
         shell: bash
         run: |