ci(lint): install nph from git HEAD to dodge nimble SAT solver

Tagged nph releases pin nim < 2.1 or have broken transitive deps, but
choosenim installs nim 2.2.10. Nimble's resolver picks a different path
each run; installing from HEAD bypasses the solver entirely.

.github/workflows/lint.yml

@@ -232,7 +232,7 @@ jobs:
 
     - name: Install nph
       if: matrix.type == 'nim'
-      run: nimble install -y nph
+      run: nimble install -y "https://github.com/arnetheduck/nph"
 
     # Rust Setup (pinned to match locally-verified clippy version)
     - name: Install Rust 1.92.0