Udate build_date for Python 3.14.5

Author: raulcd

compose.yaml

@@ -1207,7 +1207,7 @@ services:
       args:
         base: "${ARCH}/alpine:${ALPINE_LINUX}"
         python_version: ${PYTHON}
-        build_date: "20251014"  # python-build-standalone release date
+        build_date: "20260510"  # python-build-standalone release date
         arch: ${ARCH_ALIAS}
       context: .
       dockerfile: ci/docker/python-free-threaded-wheel-musllinux-test-imports.dockerfile
@@ -1251,7 +1251,7 @@ services:
       args:
         base: "${ARCH}/alpine:${ALPINE_LINUX}"
         python_version: ${PYTHON}
-        build_date: "20251014"  # python-build-standalone release date
+        build_date: "20260510"  # python-build-standalone release date
         arch: ${ARCH_ALIAS}
       context: .
       dockerfile: ci/docker/python-free-threaded-wheel-musllinux-test-unittests.dockerfile