Revert the julia-args input for julia-runtest

julia-runtest does not accept a julia-args input (the action warned and
ignored it), and Julia 1.11 does not honor JULIA_HEAP_SIZE_HINT, so there
is no clean way to bound the test heap through this action. The 1.11 job
failure needs its log to diagnose further.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: dennisYatunin

.github/workflows/UnitTests.yml

@@ -49,11 +49,6 @@ jobs:
       - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
-        with:
-          # Bound the heap so the test suite is not killed on the 7 GB runners
-          # (the whole suite runs in one process, and Julia 1.11 reaches a
-          # higher memory watermark than 1.10 with default GC settings).
-          julia-args: '--heap-size-hint=3G'
       - uses: julia-actions/julia-processcoverage@latest
       - uses: codecov/codecov-action@v7
         if: ${{ matrix.version == '1.10' }} && ${{ matrix.os == 'ubuntu-latest' }}