2025.4.2

What's Changed

• Set version number to 2025.4.1 by @connorjward in #4355
• Set setuptools min version by @connorjward in #4357
• Fast diagonalization demo by @pbrubeck in #4309
• Fix homogeneous DirichletBC residual by @pbrubeck in #4370
• ImplicitMatrixContext: Fix dual space for matfree SLATE Inverse by @pbrubeck in #4360
• Fix typo in test by @pbrubeck in #4359
• ASM: support Extruded Periodic meshes by @pbrubeck in #4352
• Knook/EquationBC_GMG by @KarsKnook in #4338
• Add Firedrake 25 information to the website by @connorjward in #4371
• GTMGPC: use the new Interpolate by @pbrubeck in #4374
• Use petsc.org instead of mcs.anl.gov for PETSc links by @connorjward in #4379
• 'Fix' petsc raises by @connorjward in #4384
• Remove old link from docs by @JHopeCollins in #4417
• Bump PETSc and SLEPc versions by @connorjward in #4419
• bump pyadjoint dependency version by @dham in #4424

Full Changelog: 2025.4.1...2025.4.2