v0.6.1-rc.1

• Docs: document dependencies for building in INSTALL.md.
• CI: Bump ubuntu to 24.04, with clang 18 as default clang.
• Previously, when building tracexec, even if --no-default-feaures is specified,
  libbpf still gets vendored once because it is also depended in libbpf-cargo build dependency.
  This release fixes it.
• Fix the help entry of breakpoint manager.
• Fix: eBPF: only remove pgid from closure if follow-forks
• Fix: eBPF: simplify program to make it load on kernel >= 6.8
• Fix: eBPF: add a temporary workaround(d7f23b4) to make it load in release mode on new kernels.
  A side effect is some empty printk output in /sys/kernel/debug/tracing/trace_pipe. See the commit for more details.