mem::tests::peak_rss_is_at_least_current_rss fails on alpinelinux #186

failures:

---- mem::tests::peak_rss_is_at_least_current_rss stdout ----

thread 'mem::tests::peak_rss_is_at_least_current_rss' (11472) panicked at tgrep-cli/src/mem.rs:468:9:
peak RSS 14008320 should be >= current RSS 14020608
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    mem::tests::peak_rss_is_at_least_current_rss

test result: FAILED. 303 passed; 1 failed; 1 ignored; 0 measured; 0 filtered out; finished in 1.21s