chore(deps): update rust crate bigdecimal to 0.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bigdecimal	workspace.dependencies	minor	0.3 -> 0.4

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[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/rm/rm1
GNU test failed: tests/rm/rm2. tests/rm/rm2 is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/tail-2/inotify-dir-recreate