parser: update regression suite to latest & fix pg19 issues #972

Job	Run time
pre_job	8s
macos (macos-14, aarch64)	44s
linux (ubuntu-latest, x86_64, yum install clang llvm llvm-devel perl-IPC-Cmd -y && python3 -m ens...	2m 48s
windows (windows-latest, x86)	2m 10s
macos (macos-14, x86_64)	1m 1s
sdist	26s
linux (ubuntu-latest, aarch64-unknown-linux-gnu, --zig, python3 -m pip install ziglang==0.11.0 )	4m 11s
windows (windows-latest, x64)	2m 1s
Release	-1s
	13m 28s

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