Chisel v7.15.0

Fixes

• Make FileCheck directory clearing more robust (by @jackkoenig in #5474)

Documentation

• docs: add DPI explainer (by @trmckay in #5469)

Dependency Updates

• [cd] Bump CIRCT from firtool-1.155.0 to firtool-1.156.0 (by @chiselbot in #5470)
• [cd] Bump CIRCT from firtool-1.156.0 to firtool-1.157.0 (by @chiselbot in #5472)
• [cd] Bump CIRCT from firtool-1.157.0 to firtool-1.158.0 (by @chiselbot in #5476)

Build and Internal Changes

• Bump js-yaml from 3.14.2 to 3.15.1 in /website (by @dependabot[bot] in #5461)
• [main] Enable MiMa for v7.14.0 (by @chiselbot in #5466)
• [build] Ignore generated website API docs (by @jackkoenig in #5467)

Full Changelog: v7.14.0...v7.15.0