Change manylinux image type

Numpy no longer provides manylinux2014 images. It seems to be backwards
compatible to just bump the manulinux version for all versions of Python
that we support.

Author: AlexanderWells-diamond

.github/workflows/code.yml

@@ -118,7 +118,7 @@ jobs:
           # Disable auditwheel as it isn't compatible with setuptools_dso approach
           # https://github.com/mdavidsaver/setuptools_dso/issues/17
           CIBW_REPAIR_WHEEL_COMMAND: ""
-          CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
+          CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28
           CIBW_ENVIRONMENT_LINUX: SETUPTOOLS_DSO_PLAT_NAME=manylinux2014_x86_64
           CIBW_SKIP: "*-musllinux*" # epicscorelibs doesn't build on musllinux platforms