v0.5.4

FixedPointDecimals v0.5.4

Diff since v0.5.3

Merged pull requests:

• enable dependabot for GitHub actions (#79) (@ranocha)
• Bump codecov/codecov-action from 1 to 5 (#96) (@dependabot[bot])
• Bump actions/checkout from 2 to 4 (#98) (@dependabot[bot])
• Bump julia-actions/setup-julia from 1 to 2 (#99) (@dependabot[bot])
• Use julia-actions/cache (#101) (@omus)
• Add with_overflow for add, sub, and mul (#102) (@mbarbar)
• 0.5.4: *_with_overflow for add, sub, mul (#103) (@NHDaly)