Require [compat] entry for julia

src/deps_compat.jl

@@ -2,7 +2,7 @@
     Aqua.test_deps_compat(package)
 
 Test that the `Project.toml` of `package` has a `compat` entry for
-each package listed under `deps`.
+each package listed under `deps` and for `julia`.
 
 # Arguments
 - `packages`: a top-level `Module`, a `Base.PkgId`, or a collection of
@@ -86,6 +86,9 @@ function find_missing_deps_compat(
     ignore::AbstractVector{Symbol} = Symbol[],
 )
     deps = get(prj, deps_type, Dict{String,Any}())
+    if deps_type == "deps"
+        deps["julia"] = "00000000-0000-0000-0000-000000000000"
+    end
     compat = get(prj, "compat", Dict{String,Any}())
 
     missing_compat = sort!(