Adjust trimming test to JSON.jl ≥1.0 (#59738)

Adapt to major update of JSON.jl:
JuliaIO/JSON.jl#374

Author: topolarity

test/trimming/Project.toml

@@ -8,3 +8,6 @@ Zstd_jll = "3161d3a3-bdf6-5164-811a-617609db77b4"
 
 [sources]
 Zstd_jll = {path = "Zstd_jll"}
+
+[compat]
+JSON = "1"

test/trimming/trimming.jl

@@ -35,7 +35,7 @@ let exe_suffix = splitext(Base.julia_exename())[2]
     str = read(joinpath(bindir, "bindinginfo_libsimple.json"), String)
 
     # The log should parse as valid JSON
-    abi = JSON.Parser.parse(str)
+    abi = JSON.parse(str)
 
     # `copyto_and_sum` should have been exported
     @test any(Bool[func["symbol"] == "copyto_and_sum" for func in abi["functions"]])