`paste` dependency is unmaintained

[rursprung]

i get the following warning from cargo-audit:

 Crate:     paste
Version:   1.0.15
Warning:   unmaintained
Title:     paste - no longer maintained
Date:      2024-10-07
ID:        RUSTSEC-2024-0436
URL:       https://rustsec.org/advisories/RUSTSEC-2024-0436
Dependency tree:
paste 1.0.15
└── pio-core 0.3.0
    ├── pio-proc 0.3.0
    │   └── pio 0.3.0
    │       └── embassy-rp 0.4.0
    │           └── [..]
    ├── pio-parser 0.3.0
    │   └── pio-proc 0.3.0
    └── pio 0.3.0

i'm not sure what the replacement is, though