development-dependency: bump solargraph from 0.40.3 to 0.40.4

Bumps solargraph from 0.40.3 to 0.40.4.

Changelog

Sourced from solargraph's changelog.

0.40.4 - March 3, 2021

• Fix optarg and blockarg ordering
• Override specialization for #initialize
• Find definitions with cursor after double colon

Commits

• 18854d7 Version bump
• 89f9f8c Find definitions with cursor after double colon
• c02e60b Rename macro_pin? to virtual_pin?
• 045c60c Override specialization for #initialize (#360)
• 3d3fd32 Fix optarg and blockarg ordering
• See full diff in compare view