Merge bitcoin/bitcoin#34481: Update secp256k1 subtree to latest master

d405713197 ci: use Alpine 3.23 (fanquake)
1cee0e4cd3 ci: detect apk usage generally (fanquake)
9d4c9b0035 Squashed 'src/secp256k1/' changes from 14e56970cb..57315a6985 (fanquake)

Pull request description:

  Updates the secp256k1 subtree to latest master (https://github.com/bitcoin-core/secp256k1/commit/57315a69853c9bd4765fccf20b541d47f1b45ca9), which includes https://github.com/bitcoin-core/secp256k1/pull/1813.

ACKs for top commit:
  maflcko:
    lgtm ACK d405713197
  hebasto:
    ACK d405713197.

Tree-SHA512: 6f01f85c309d7b823f41f215a9c856871dcd3d4113ac38cf2cf8e2f2c8a4c9d5f3c9f0e12b95cd9140045c66523eeb49aa536c0e91f9d17d5bf81fc95a2ad689

ci/test/00_setup_env_native_alpine_musl.sh

@@ -7,7 +7,7 @@
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_alpine_musl
-export CI_IMAGE_NAME_TAG="mirror.gcr.io/alpine:3.22"
+export CI_IMAGE_NAME_TAG="mirror.gcr.io/alpine:3.23"
 export CI_BASE_PACKAGES="build-base musl-dev pkgconf curl ccache make ninja git python3-dev py3-pip which patch xz procps rsync util-linux bison e2fsprogs cmake dash linux-headers"
 export PIP_PACKAGES="--break-system-packages pyzmq pycapnp"
 export DEP_OPTS="DEBUG=1"

ci/test/01_base_install.sh

@@ -37,7 +37,7 @@ if [ -n "${APT_LLVM_V}" ]; then
   )
 fi
 
-if [[ $CI_IMAGE_NAME_TAG == *alpine* ]]; then
+if command -v apk >/dev/null 2>&1; then
   ${CI_RETRY_EXE} apk update
   # shellcheck disable=SC2086
   ${CI_RETRY_EXE} apk add --no-cache $CI_BASE_PACKAGES $PACKAGES