Fix various new clippy warnings due to MSRV bump

generic/sodium/src/decrypter/imp.rs

generic/sodium/src/encrypter/imp.rs

generic/threadshare/examples/standalone/src/imp.rs

generic/threadshare/src/runtime/executor/scheduler.rs

generic/threadshare/src/runtime/pad.rs

generic/threadshare/src/runtime/task.rs

net/hlssink3/src/hlsbasesink.rs

net/rtsp/src/rtspsrc/imp.rs

text/json/src/jsongstparse/imp.rs

utils/fallbackswitch/src/fallbacksrc/imp.rs

video/closedcaption/src/mcc_parse/imp.rs

video/closedcaption/src/mcc_parse/parser.rs

video/closedcaption/src/scc_parse/imp.rs

video/closedcaption/src/scc_parse/parser.rs

video/gtk4/src/sink/imp.rs