Unpin kernel version

[TheanLim]

Summary

Undo #437 to unpin kernel version from 5.10.235*
Agent version was already upgraded in #442

Implementation details

Undo #437 to unpin kernel version from 5.10.235*

Testing

Build custom AMIs (AL2 Kernel 5.10 AMD and AL2 Kernel 5.10 ARM) with this PR code changes and using the latest AL2 source AMI per #445
SSH-ed into instances and ran these commands

sh-4.2$ uname -r
5.10.237-230.948.amzn2.aarch64
sh-4.2$ cat /sys/fs/cgroup/blkio/blkio.throttle.io_service_bytes | tail -1
Total 1770810880


---

sh-4.2$ uname -r
5.10.237-230.948.amzn2.x86_64
sh-4.2$ cat /sys/fs/cgroup/blkio/blkio.throttle.io_service_bytes | tail -1
Total 638600192

The above shows that disk metrics are being reported

New tests cover the changes: no

Description for the changelog

Bugfix - Unpin kernel version from 5.10.235*

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.