0.31.6

Various fixes & improvements

• Apply clippy fixes and cherry-pick PRs (#610) by @Swatinem
• ref: Apply user field from scope to transaction event (#596) by @kamilogorek
• Remove profiling support (#595) by @viglia
• chore: upgrade webpki-roots 0.22.5 -> 0.23.0 (#593) by @boxdot