Test commit: unset ENV variable

Author: jishnub

.ci/run_tests.jl

@@ -7,4 +7,4 @@ end
 proj = abspath(joinpath(@__DIR__, ".."))
 cmd = """Base.runtests(["LinearAlgebra"]; propagate_project=true, ncores=$ncores)"""
 run(addenv(`$(Base.julia_cmd()) --project=$proj --compiled-modules=existing -e $cmd`,
-    "JULIA_NUM_THREADS" => 1, "JULIA_PRUNE_OLD_LA" => true))
+    "JULIA_NUM_THREADS" => 1))