chore: Right align line numbers in ui-test #75
                
     Merged
            
            
          
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Problem: rust-lang/rust@aa97672 right
aligned line numbers & this change was released in Rust 1.90. This
causes our trybuild driven ui-tests to fail because the line number
differs.
Solution: Fix the line numbering in the test's stderr file & bump our
min trybuild dependency to v1.0.108 because that is the first version
that recognizes right aligned line numbers.
Testing: Ran
cargo +1.90 testand saw that it worked. Also testedspecifying `trybuild = "=1.0.n" and saw that n=108 was the lowest
working version.
Ref: rust-lang/rust#144609
Ref: dtolnay/trybuild#308
Ref: dtolnay/trybuild#315