Remove vestigial LLVM_jll from the test environment.

Author: maleadt

test/Project.toml

@@ -6,7 +6,6 @@ GPUCompiler = "61eb1bfa-7361-4325-ad38-22787b887f55"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 LLVM = "929cbde3-209d-540e-8aea-75f648917ca0"
 LLVMDowngrader_jll = "f52de702-fb25-5922-94ba-81dd59b07444"
-LLVM_jll = "86de99a1-58d6-5da7-8064-bd56ce2e322c"
 Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"
 NVPTX_LLVM_Backend_jll = "ef6e0fe3-e6ef-59c0-bde6-4989574699e0"
 ParallelTestRunner = "d3525ed8-44d0-4b2c-a655-542cee43accc"
@@ -21,5 +20,4 @@ demumble_jll = "1e29f10c-031c-5a83-9565-69cddfc27673"
 
 [compat]
 Aqua = "0.8"
-LLVM_jll = "15,16,18,20"
 ParallelTestRunner = "2"