🐍⬆️ update image for Linux wheel builds to manylinux_2_28 (#453)

## Description

CentOS 7, which the default `manylinux2014` image is based on, reached
end-of-life in June 2024.
The only meaningful platforms left that do not provide a recent enough
`glibc` version are some `Amazon Linux 2` platforms, which are not
really relevant for the MQT.

This PR moves the Linux wheel builds to the more recent `manylinux_2_28`
images, which offers many performance improvements and optimizations.

## Checklist:

<!---
This checklist serves as a reminder of a couple of things that ensure
your pull request will be merged swiftly.
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- [x] The pull request only contains commits that are related to it.
- [x] I have added appropriate tests and documentation.
- [x] I have made sure that all CI jobs on GitHub pass.
- [x] The pull request introduces no new warnings and follows the
project's style guidelines.

---------

Signed-off-by: burgholzer <burgholzer@me.com>

.github/workflows/cd.yml

@@ -7,6 +7,10 @@ on:
     paths:
       - .github/workflows/cd.yml
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   python-packaging:
     name: 🐍 Packaging

pyproject.toml

@@ -287,6 +287,10 @@ test-command = "python -c \"from mqt import qcec\""
 test-skip = ["cp38-macosx_arm64", "cp313*"] # skip testing on Python 3.13 until our dependencies are ready
 build-frontend = "build[uv]"
 free-threaded-support = true
+manylinux-x86_64-image = "manylinux_2_28"
+manylinux-aarch64-image = "manylinux_2_28"
+manylinux-ppc64le-image = "manylinux_2_28"
+manylinux-s390x-image = "manylinux_2_28"
 
 [tool.cibuildwheel.linux]
 environment = { DEPLOY="ON" }