Upgrade to oxipng 9.1 and latest native dependencies (#15)

- Deprecated: collection options such as `filter` that that previously supported `set` types now expect `Sequence` types such as `list` or `tuple`. Support for `set` will be removed in v10.
- Dropped build support for old operating systems that reached end-of-life
- Disable x86, armv7, s390x, ppc64le manylinux pip builds (breaking due to deflate dependency)
- Update to oxipng 9.1
- Update build toolchain
- Refactor internals

Author: nfrasser

.github/workflows/CI.yml

@@ -26,16 +26,16 @@ jobs:
         platform:
           - runner: ubuntu-22.04
             target: x86_64
-          - runner: ubuntu-22.04
-            target: x86
+          # - runner: ubuntu-22.04
+          #   target: x86
           - runner: ubuntu-22.04
             target: aarch64
-          - runner: ubuntu-22.04
-            target: armv7
-          - runner: ubuntu-22.04
-            target: s390x
-          - runner: ubuntu-22.04
-            target: ppc64le
+          # - runner: ubuntu-22.04
+          #   target: armv7
+          # - runner: ubuntu-22.04
+          #   target: s390x
+          # - runner: ubuntu-22.04
+          #   target: ppc64le
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -45,9 +45,10 @@ jobs:
         uses: PyO3/maturin-action@v1
         with:
           target: ${{ matrix.platform.target }}
+          before-script-linux: "(python3 -m pip --version || python3 -m ensurepip)"
           args: --release --out dist --interpreter 3.8 3.9 3.10 3.11 3.12 3.13
           sccache: "true"
-          manylinux: auto
+          manylinux: 2_28
       - name: Upload wheels
         uses: actions/upload-artifact@v4
         with: