Fix GitHub actions

[NimaSarajpoor]

This PR is an attempt to fix the following error that was raised recently in a Github Actions run when running sudo apt-get install libxml2-utils

Reading package lists...
Building dependency tree...
Reading state information...
The following NEW packages will be installed:
  libxml2-utils
0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
Need to get 39.4 kB of archives.
After this operation, 189 kB of additional disk space will be used.
Get:1 file:/etc/apt/apt-mirrors.txt Mirrorlist [144 B]
Ign:2 http://azure.archive.ubuntu.com/ubuntu noble-updates/main amd64 libxml2-utils amd64 2.9.14+dfsg-1.3ubuntu3.8
Ign:2 https://archive.ubuntu.com/ubuntu noble-updates/main amd64 libxml2-utils amd64 2.9.14+dfsg-1.3ubuntu3.8
Ign:2 https://security.ubuntu.com/ubuntu noble-updates/main amd64 libxml2-utils amd64 2.9.14+dfsg-1.3ubuntu3.8
Err:2 mirror+file:/etc/apt/apt-mirrors.txt noble-updates/main amd64 libxml2-utils amd64 2.9.14+dfsg-1.3ubuntu3.8
  404  Not Found [IP: 52.161.185.214 80]
E: Failed to fetch mirror+file:/etc/apt/apt-mirrors.txt/pool/main/libx/libxml2/libxml2-utils_2.9.14%2bdfsg-1.3ubuntu3.8_amd64.deb  404  Not Found [IP: 52.161.185.214 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
Error: Process completed with exit code 100.

[gitnotebooks]

Review these changes at https://app.gitnotebooks.com/stumpy-dev/sliding_dot_product/pull/44

[NimaSarajpoor]

@seanlaw
Noticed an error in Github Actions. Fixed it. All good to merge?

[seanlaw]

Yes, that looks fine