test: tempolary disable the test of pl$mem_address

[eitsupi]

The release of the binary library failed because this test failed on R devel, possibly due to not updating the extendr (#1154).

══ Failed tests ════════════════════════════════════════════════════════════════
── Error ('test-extendr-meta.R:7:3'): clone_robj + mem_adress ──────────────────
Error in `mem_address(robj)`: R_ExternalPtrAddr: argument of type ENVSXP is not an external pointer
Backtrace:
    ▆
 1. ├─testthat::expect_identical(pl$mem_address(env), pl$mem_address(env2)) at test-extendr-meta.R:7:3
 2. │ └─testthat::quasi_label(enquo(object), label, arg = "object")
 3. │   └─rlang::eval_bare(expr, quo_get_env(quo))
 4. └─pl$mem_address(env)
 5.   └─polars:::mem_address(robj)