Maintainer updates for testing, gdb, semihosting and plugins (pre-PR) This collects up a number of fixes across my various maintainer trees. There will be a longer plugins related one coming later but I wanted to turn these around first. The update to bookworm was delayed from the last release but I've now "solved" that by moving sh4 and alpha into a legacy container stuck on bullseye. v2 - further split the first alpha patch - re-base and merge conflicts - address comments and tags The following still need review: tests/docker: upgrade debian-all-test-cross to bookworm (1 acks, 1 sobs, 0 tbs) tests/docker: use debian-all-test-cross for sparc64 tests/docker: move sh4 to use debian-legacy-test-cross gitlab: add build-loongarch to matrix gitlab: clean-up build-soft-softmmu job gitlab: split alpha testing into a legacy container