ci: use manylinux_2_39 for riscv64 (2_28 has no riscv64 image)

Author: gounthar

.github/workflows/wheels.yml

@@ -94,11 +94,12 @@ jobs:
             os: ubuntu-24.04-arm
             cibw_arch: aarch64
             build: "*manylinux*"
-          - name: "manylinux_2_28 riscv64"
+          - name: "manylinux_2_39 riscv64"
             platform: linux
             os: ubuntu-latest
             cibw_arch: riscv64
             build: "cp3{12,13}-manylinux*"
+            manylinux: "manylinux_2_39"
           - name: "iOS arm64 device"
             platform: ios
             os: macos-latest
@@ -142,6 +143,7 @@ jobs:
           CIBW_MANYLINUX_AARCH64_IMAGE: ${{ matrix.manylinux }}
           CIBW_MANYLINUX_PYPY_AARCH64_IMAGE: ${{ matrix.manylinux }}
           CIBW_MANYLINUX_PYPY_X86_64_IMAGE: ${{ matrix.manylinux }}
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ matrix.manylinux }}
           CIBW_MANYLINUX_X86_64_IMAGE: ${{ matrix.manylinux }}
           MACOSX_DEPLOYMENT_TARGET: ${{ matrix.macosx_deployment_target }}