CI: Update FreeBSD image version for Cirrus runner. #1456

Job	Run time
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs on; GnuPG stable]	2s
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs on; GnuPG stable]	8m 51s
windows-latest msys2 [msystem ucrt64; backend openssl; build shared libs on; GnuPG stable]	2s
windows-latest msys2 [msystem ucrt64; backend openssl; build shared libs on; GnuPG stable]	7m 29s
windows-latest msys2 [msystem mingw64; backend botan; build shared libs on; GnuPG stable]	2s
windows-latest msys2 [msystem mingw64; backend botan; build shared libs on; GnuPG stable]	8m 29s
windows-latest msys2 [msystem mingw64; backend openssl; build shared libs on; GnuPG stable]	8m 48s
windows-latest msys2 [msystem mingw64; backend openssl; build shared libs on; GnuPG stable]	8m 48s
windows-latest msys2 [msystem clang64; backend botan; build shared libs on; GnuPG stable]	8m 56s
windows-latest msys2 [msystem clang64; backend botan; build shared libs on; GnuPG stable]	8m 56s
windows-latest msys2 [msystem clang64; backend openssl; build shared libs on; GnuPG stable]	7m 36s
windows-latest msys2 [msystem clang64; backend openssl; build shared libs on; GnuPG stable]	7m 36s
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs off; GnuPG stable]	54s
windows-latest msys2 [msystem ucrt64; backend botan; build shared libs off; GnuPG stable]	9m 5s
	1h 25m 34s

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