spat 1.3.0

We encountered an error during the generation of documentation:
spat.gpr: info: Parsing "/home/chouteau/src/github/alire/docs.ada.dev/tmp/spat/1.3.0/spat_1.3.0_4ad4ab14/spat.gpr"
spat.gpr: info: search path:
spat.gpr: info: /home/chouteau/src/github/alire/docs.ada.dev/tmp/spat/1.3.0/spat_1.3.0_4ad4ab14
spat.gpr: info: /home/chouteau/.config/alire/cache/dependencies/gnat_native_12.1.2_66b989b5
spat.gpr: info: /home/chouteau/.config/alire/cache/dependencies/gprbuild_22.0.1_24dfc1b5
spat.gpr: info: /home/chouteau/src/github/alire/docs.ada.dev/tmp/spat/1.3.0/spat_1.3.0_4ad4ab14/alire/cache/dependencies/si_units_0.2.0_13606e49
spat.gpr: info: /home/chouteau/.config/alire/cache/dependencies/gnat_native_12.1.2_66b989b5/x86_64-linux/share/gpr
spat.gpr: info: /home/chouteau/.config/alire/cache/dependencies/gnat_native_12.1.2_66b989b5/x86_64-linux/lib/gnat
spat.gpr: info: /home/chouteau/.config/alire/cache/dependencies/gnat_native_12.1.2_66b989b5/share/gpr
spat.gpr: info: /home/chouteau/.config/alire/cache/dependencies/gnat_native_12.1.2_66b989b5/lib/gnat
spat.gpr:1:06: error: imported project file "gnatcoll.gpr" not found

raised GPR2.PROJECT_ERROR : /home/chouteau/src/github/alire/docs.ada.dev/tmp/spat/1.3.0/spat_1.3.0_4ad4ab14/spat.gpr: fatal error, cannot load the project tree
ERROR: Command ["gnatdoc4", "-P", "spat.gpr", "--output-dir", "/home/chouteau/src/github/alire/docs.ada.dev/crate/spat/1.3.0", "--front-matter", "crate: spat", "--no-subprojects"] exited with code 1