flake.nixpkgs: pin apacheHttpd for php74 support #673

Job	Run time
nix (aarch64, fmt -- --check)	15s
nix (aarch64, eval .#apps.$_system.nixos-shell.program)	13s
nix (aarch64, eval .#apps.$_system.setup.program)	12s
nix (x86_64, fmt -- --check)	3m 42s
nix (x86_64, eval .#apps.$_system.nixos-shell.program)	2m 53s
nix (x86_64, eval .#apps.$_system.setup.program)	4m 19s
nix (develop .#jdk8 --profile result, x86_64)	4m 41s
nix (develop .#jdk11 --profile result, x86_64)	4m 29s
nix (develop .#jdk17 --profile result, x86_64)	3m 16s
nix (develop .#php74 --profile result, x86_64)	4m 29s
nix (develop .#php74-composer1 --profile result, x86_64)	2m 45s
nix (develop .#php80 --profile result, x86_64)	2m 41s
nix (develop .#php81 --profile result, x86_64)	4m 16s
nix (build .#homeConfigurations."tobias@gamer".activationPackage, x86_64)	4m 34s
nix (build .#nixOnDroidConfigurations.pixel7a.activationPackage --impure, aarch64)	25s
nix (build .#nixosConfigurations.argon.config.system.build.toplevel, aarch64, argon)	1m 39s
nix (build .#nixosConfigurations.krypton.config.system.build.toplevel, x86_64, krypton)	5m 59s
nix (build .#nixosConfigurations.neon.config.system.build.toplevel, x86_64, neon, --async)	7m 6s
nix (build .#nixosConfigurations.xenon.config.system.build.toplevel, aarch64, xenon)	3m 1s
nix (build .#packages.$_system.rpi-firmware, aarch64)	12s
nix (build .#packages.$_system.rpi-image, aarch64)	48s
nix (build .#packages.$_system.installer-image, x86_64)	6m 42s
	1h 8m 37s

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