[NFC] Remove pointless variable

`jobs` is already clamped to be no higher than the number of tests so `min(job, length(tests))` is redundant

Author: christiangnrd

src/ParallelTestRunner.jl

@@ -832,8 +832,7 @@ function runtests(mod::Module, args::ParsedArgs;
     jobs = something(args.jobs, default_njobs())
     jobs = clamp(jobs, 1, length(tests))
     println(stdout, "Running $jobs tests in parallel. If this is too many, specify the `--jobs=N` argument to the tests, or set the `JULIA_CPU_THREADS` environment variable.")
-    nworkers = min(jobs, length(tests))
-    workers = fill(nothing, nworkers)
+    workers = fill(nothing, jobs)
 
     t0 = time()
     results = []