Switch to helios-latest target for buildomat jobs.

Author: luqmana

.github/buildomat/jobs/falcon-build.sh

@@ -2,7 +2,7 @@
 #:
 #: name = "falcon"
 #: variety = "basic"
-#: target = "helios"
+#: target = "helios-latest"
 #: rust_toolchain = "stable"
 #: output_rules = [
 #:   "/work/debug/*",

.github/buildomat/jobs/image.sh

@@ -2,7 +2,7 @@
 #:
 #: name = "image"
 #: variety = "basic"
-#: target = "helios"
+#: target = "helios-latest"
 #: rust_toolchain = "stable"
 #: output_rules = [
 #:   "/out/*",

.github/buildomat/jobs/phd-build.sh

@@ -2,7 +2,7 @@
 #:
 #: name = "phd-build"
 #: variety = "basic"
-#: target = "helios"
+#: target = "helios-latest"
 #: rust_toolchain = "stable"
 #: output_rules = [
 #:   "/out/*",