2025-04-14 Babeltrace 2.1.1 (Pecan Day)

• src.ctf.lttng-live: remove lttng_live_lazy_msg_init function
• src.ctf.lttng-live: fix comment formatting
• README.adoc: Update working version to 2.1
• fix: export bt_component_class_sink_simple_borrow
• fix: building from the release tarball without flex
• doc/api/libbabeltrace2: use <code> i.o. <span> in <dt>
• Fix: doc/api/libbabeltrace2/Doxyfile.in: set version to 2.1
• babeltrace2-sink.text.pretty(7): add missing default param. value
• Update working version to Babeltrace v2.1.1