Update to Anchor 0.31 (#87)

* wip: update to Anchor 0.31

* remove old whirlpool crate, add kamino lend

* switch to rust 1.86

* clippy fix

* fix clippy warnings

* update readme

Author: macalinao

.github/workflows/release.yml

@@ -8,7 +8,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  RUST_TOOLCHAIN: "1.61.0"
+  RUST_TOOLCHAIN: "1.86.0"
 
 jobs:
   release:

.github/workflows/rust.yml

@@ -8,7 +8,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  RUST_TOOLCHAIN: "1.61.0"
+  RUST_TOOLCHAIN: "1.86.0"
 
 jobs:
   lint: