Merge bitcoin-core/secp256k1#1828: Revert "ci, docker: Fix LLVM repository signature failure"

76e92cfeea Revert "ci, docker: Fix LLVM repository signature failure" (Hennadii Stepanov)

Pull request description:

  This reverts commit 0ffb1749a5, as the underlying [issue](https://github.com/llvm/llvm-project/issues/153385) has been resolved.

ACKs for top commit:
  real-or-random:
    ACK 76e92cfeea

Tree-SHA512: 3cab40ab5d3c1d180b81414ec212481468898ec36dba22acce5fd0dc0b506c0beefc5d9df27bf9e94c1aa006ba18f70072bb1fcbc31acdddaead678009f82c19

ci/linux-debian.Dockerfile

@@ -67,9 +67,6 @@ RUN \
     wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc && \
     # Add repository for this Debian release
     . /etc/os-release && echo "deb http://apt.llvm.org/${VERSION_CODENAME} llvm-toolchain-${VERSION_CODENAME} main" >> /etc/apt/sources.list && \
-    # Temporarily work around Sequoia PGP policy deadline for legacy repositories.
-    # See https://github.com/llvm/llvm-project/issues/153385.
-    sed -i 's/\(sha1\.second_preimage_resistance =\).*/\1 9999-01-01/' /usr/share/apt/default-sequoia.config && \
     apt-get update && \
     # Determine the version number of the LLVM development branch
     LLVM_VERSION=$(apt-cache search --names-only '^clang-[0-9]+$' | sort -V | tail -1 | cut -f1 -d" " | cut -f2 -d"-" ) && \