Summary: Update GitHub matrix to use correct 6.1.x kernel

Builds after #1995 would fail since GitHub would attempt to run the
6.1.8 kernel build, which bazel no longer understands. This also updates
the qemu test runner kernel that was incorrectly updated in #1999. I
thought I had exercised that default value with my testing, but it
didn't trigger that default value.

Relevant Issues: N/A

Type of change: /kind bugfix

Test Plan: GitHub build on #2002 which pulls in the matrix change is no
longer failing

Summary: Update GitHub matrix to use correct 6.1.x kernel

Builds after pixie-io#1995 would fail since GitHub would attempt to run the
6.1.8 kernel build, which bazel no longer understands. This also updates
the qemu test runner kernel that was incorrectly updated in pixie-io#1999. I
thought I had exercised that default value with my testing, but it
didn't trigger that default value.

Relevant Issues: N/A

Type of change: /kind bugfix

Test Plan: GitHub build on pixie-io#2002 which pulls in the matrix change is no
longer failing

GitOrigin-RevId: 9ae53a8

…pixie-io#2002)

Summary: Use correct byte ordering function for kernel struct member
(skc_num)

This change doesn't result in a functional difference since `ntohs` and
`htons` are inverses of each other on little endian machines (and noops
for big endian machines). This field's byte order caused me confusion in
pixie-io#1989, so I wanted to make this struct access consistent.

Relevant Issues: N/A

Type of change: /kind cleanup

Test Plan: Testing during pixie-io#1989 (details
[here](pixie-io#1989 (comment)))

Signed-off-by: Dom Del Nano <ddelnano@gmail.com>
GitOrigin-RevId: 6fc0f18