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datetime: fix strptime for fuzzer

Google fuzzing efforts revealed yet another bound condition
we don't handle well in the `tnt_strptime` function:

- for format `%m%g%W`;
- and input string `07001`.

We failed with assertion failure:
```
  | datetime_strptime_fuzzer: ./src/lib/core/datetime.c:148: \
_Bool tm_to_datetime(struct tnt_tm *, struct datetime *): \
Assertion `mday >= 1 && mday <= 31' failed.
```

Closes #8525

NO_TEST=updated fuzzer corpus
NO_CHANGELOG=internal
NO_DOC=internal

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