Merge #848: Tempararily pin fuzzer on rust 1.58

8016a85 Tempararily pin fuzzer on rust 1.58 (sanket1729)

Pull request description:

  I think this might take a while to resolve and we should move ahead with
  1.58. Looks like the fresh release of 1.59 added LLVM 13.0 that broke
  some things.

ACKs for top commit:
  Kixunil:
    ACK 8016a85
  apoelstra:
    ACK 8016a85

Tree-SHA512: 171cf52cdb5144e5e4a5bbbe179ad93d441c9e1c98394dce786e5e87e2020d88b81b133730a2e9a040e3520205e1456713d0a0b6473928a26254c67369b2841f

.github/workflows/fuzz.yml

@@ -27,7 +27,7 @@ jobs:
           key: cache-${{ matrix.target }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: 1.58
           override: true
           profile: minimal
       - run: cargo install honggfuzz