feat: use a manylinux_2_35 compatible image for riscv64 (#623)

This ubuntu based image provides better compatibility than the default `manylinux_2_39` pypa/manylinux image.

Author: mayeut

README.rst

@@ -68,7 +68,7 @@ The following platforms are supported with binary wheels:
   | Linux IBM Z   | | manylinux2014+  s390x   |
   |               | | musllinux_1_1+  s390x   |
   +---------------+---------------------------+
-  | Linux RISC-V  | | manylinux_2_39+ riscv64 |
+  | Linux RISC-V  | | manylinux_2_35+ riscv64 |
   |               | | musllinux_1_2+  riscv64 |
   +---------------+---------------------------+
   | macOS 10.10+  | Intel                     |

pyproject.toml

@@ -108,7 +108,7 @@ manylinux-aarch64-image = "manylinux2014"
 manylinux-ppc64le-image = "manylinux2014"
 manylinux-s390x-image = "manylinux2014"
 manylinux-armv7l-image = "manylinux_2_31"
-manylinux-riscv64-image = "manylinux_2_39"
+manylinux-riscv64-image = "ghcr.io/mayeut/manylinux_2_35:2025.08.02-2"
 musllinux-x86_64-image = "quay.io/pypa/musllinux_1_1_x86_64:2024.10.26-1"
 musllinux-i686-image = "quay.io/pypa/musllinux_1_1_i686:2024.10.26-1"
 musllinux-aarch64-image = "quay.io/pypa/musllinux_1_1_aarch64:2024.10.26-1"