v0.19.4

PencilArrays v0.19.4

Diff since v0.19.3

Merged pull requests:

• Bump julia-actions/setup-julia from 1 to 2 (#91) (@dependabot[bot])
• Bump codecov/codecov-action from 3 to 4 (#92) (@dependabot[bot])
• Bump julia-actions/cache from 1 to 2 (#93) (@dependabot[bot])
• Fix ambiguity error when calling rand! (#94) (@jipolanco)