CI: Switch to GCC 13, latest available in Ubuntu 24.04 images. #1211

Job	Run time
Empty APLOGNO() test	34s
Default	3m 38s
All-static modules	4m 2s
Prefork MPM, all-modules (except cgid)	4m 12s
Worker MPM, all-modules	4m 13s
Shared MPMs, all-modules	4m 16s
Event MPM, all-modules, mod_cgid only	4m 45s
Event MPM, all-modules, no CMSG_DATA	4m 3s
Default, all-modules + install	4m 20s
Default, all-modules, random test order	4m 3s
GCC 12 maintainer-mode w/-Werror, install + VPATH	3m 39s
All-modules, APR 1.7.4, APR-util 1.6.3	4m 9s
APR 1.8.x, APR-util 1.7.x	10m 25s
Pool-debug	6m 21s
Shared MPMs (event), pool-debug, SSL/TLS variants	9m 57s
Shared MPMs (worker), pool-debug, SSL/TLS variants	9m 32s
Shared MPMs (prefork), pool-debug, SSL/TLS variants	9m 38s
litmus WebDAV tests	2m 14s
litmus WebDAV tests, APR trunk, LMDB	2m 1s
Regenerate ap_expr	4m 7s
APR 1.7.4, APR-util 1.6.3, LDAP	8m 49s
APR 1.7.x, APR-util 1.7.x, LDAP	5m 59s
APR trunk thread debugging	5m 21s
UBSan	4m 43s
ASan	6m 36s
ASan, pool-debug	7m 40s
HTTP/2 test suite	5m 13s
Configured w/reduced exports	1m 55s
OpenSSL 3.1	3m 21s
OpenSSL 3.2 -Werror	4m 8s
OpenSSL 3.2 no-engine	3m 33s
OpenSSL 3.3 no-engine -Werror	3m 52s
	2h 41m 19s

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