science/trilinos: add missing <iostream> include

This fixes "hidden symbol
_ZNSt3__1rsB7v160006IcNS_11char_traitsIcEENS_9allocatorIcEEEERNS_13basic_istreamIT_T0_EES9_RNS_12basic_stringIS6_S7_T1_EE
isn't defined" errors on recent -CURRENT.

PR: 273339
Approved by: maintainer timeout (2 weeks)
MFH: 2023Q4