Circumvent CI hang on 1.8 (#722)

#710 attempted to debug a Requires-based hang that seems
to only occur on CI with Julia 1.8. It may be due to lock contention,
but the precise case was not obvious.

This just disables the problematic test.
Since it doesn't happen on nightly, and since Requires will be
supplanted by the new weakdeps mechanism, we can direct any
users who encounter this bug to the alternatives.

Author: timholy

test/runtests.jl

@@ -3144,18 +3144,20 @@ do_test("New files & Requires.jl") && @testset "New files & Requires.jl" begin
     @test isempty(read(warnfile, String))
     # Issue #431
     @test_throws UndefVarError TrackRequires.ftrack()
-    @eval using RoundingIntegers
-    sleep(2)  # allow time for the @async in all @require blocks to finish
-    if notified
-        @test TrackRequires.ftrack() == 1
-        id = Base.PkgId(TrackRequires)
-        pkgdata = Revise.pkgdatas[id]
-        sf = Revise.srcfiles(pkgdata)
-        @test count(name->occursin("@require", name), sf) == 1
-        @test count(name->occursin("anotherfile", name), sf) == 1
-        @test !any(isequal("."), sf)
-        idx = findfirst(name->occursin("anotherfile", name), sf)
-        @test !isabspath(sf[idx])
+    if !(get(ENV, "CI", nothing) == "true" && Base.VERSION.major == 1 && Base.VERSION.minor == 8)   # circumvent CI hang
+        @eval using RoundingIntegers
+        sleep(2)  # allow time for the @async in all @require blocks to finish
+        if notified
+            @test TrackRequires.ftrack() == 1
+            id = Base.PkgId(TrackRequires)
+            pkgdata = Revise.pkgdatas[id]
+            sf = Revise.srcfiles(pkgdata)
+            @test count(name->occursin("@require", name), sf) == 1
+            @test count(name->occursin("anotherfile", name), sf) == 1
+            @test !any(isequal("."), sf)
+            idx = findfirst(name->occursin("anotherfile", name), sf)
+            @test !isabspath(sf[idx])
+        end
     end
     @test_throws UndefVarError TrackRequires.fauto()
     @eval using UnsafeArrays
@@ -3535,14 +3537,14 @@ end
 
 do_test("includet with mod arg (issue #689)") && @testset "includet with mod arg (issue #689)" begin
     testdir = newtestdir()
-    
+
     common = joinpath(testdir, "common.jl")
     write(common, """
         module Common
             const foo = 2
         end
         """)
-    
+
     routines = joinpath(testdir, "routines.jl")
     write(routines, """
         module Routines
@@ -3551,7 +3553,7 @@ do_test("includet with mod arg (issue #689)") && @testset "includet with mod arg
             using .Common
         end
         """)
-    
+
     codes = joinpath(testdir, "codes.jl")
     write(codes, """
         module Codes