build

revert to gcc-13 for linux-glibc-debian-testing-gcc #626

Job	Run time
linux-glibc-debian-bookworm-gcc	5m 34s
linux-glibc-debian-sid-llvm-riscv64	3m 37s
linux-glibc-debian-sid-gcc-riscv64	3m 32s
linux-glibc-debian-bookworm-llvm	5m 25s
linux-glibc-debian-testing-gcc	5m 47s
linux-glibc-debian-testing-llvm	5m 15s
linux-musl-alpine-gcc	2m 57s
linux-musl-alpine-llvm	2m 59s
linux-musl-debian-bookworm-gcc	4m 48s
linux-musl-debian-bookworm-llvm	5m 3s
linux-musl-debian-sid-gcc-riscv64	3m 12s
linux-musl-debian-sid-llvm-riscv64	3m 9s
linux-musl-debian-testing-gcc	4m 33s
linux-musl-debian-testing-llvm	5m 2s
linux-musl-from-mac	7m 21s
mac-clang	3m 57s
mac-llvm	3m 41s
reuse-check	8s
shellcheck	6s
spellcheck	3s
win-gcc	6m 19s
win-llvm	7m 47s
win-llvm-from-mac	7m 44s
	1h 37m 59s

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