chore: update changelog and min rustc version

fix: clippy warnings

chore: update assembly and processor versions to 0.6.1

chore: remove version from test-utils dependencies

Merge pull request 0xPolygonMiden#726 from 0xPolygonMiden/next

Tracking PR for v0.5 release

chore: update crates.io badge

Merge pull request 0xPolygonMiden#361 from maticnetwork/next

Tracking PR for v0.3 release

fix: section order in prover's cargo.toml

added missing package version