bump dprint to 2025 + relax operatorPosition

[johncarmack1984]

Summary

• dprint CLI: 0.50.2 -> 0.54.0
• dprint-plugin-typescript: 0.85.1 -> 0.96.0
• dprint-plugin-json: 0.17.4 -> 0.21.3
• dprint-plugin-markdown: 0.15.3 -> 0.21.1
• dprint-plugin-exec: 0.4.3 -> 0.6.2
• Config: binaryExpression/conditionalExpression/conditionalType.operatorPosition set to maintain

dprint fmt is a no-op on main after the bump -- no existing source files reformat. The operatorPosition: maintain change makes dprint accept multi-line &&/||/ternary either at end-of-line or start-of-next-line, instead of forcing one. That removes a category of "works locally, fails CI" drift for external contributors.

Effect on #22 after rebase

Of the 3 files #22 currently fails dprint check on:

File	Status after this PR
example/src/lib/testing.ts	passes (was a && operator-position drift; now accepted by maintain)
taurpc/src/export.rs	unchanged -- this is rustfmt --edition 2024 let-chain layout drift, decided by which rustfmt is on PATH (CI's vs Oscar's). A rust-toolchain.toml pin in a follow-up would deterministically fix this category
README.md	unchanged -- example code in TS code fences uses "double" quotes; repo quoteStyle is preferSingle. Stylistic inconsistency in the contributed content. Either Oscar adjusts in his branch (small fix), or a follow-up adds <!-- dprint-ignore --> around the affected fences after rebase

So: this PR unblocks one of the three drifted files. The other two are content/toolchain decisions, not config.

Test plan

• pnpm install clean
• pnpm lint clean (types + format + js)
• dprint fmt produces zero diff on main
• Synthetic version of #22's testing.ts &&-style passes dprint check with new config