Bump ouroboros from 0.15.6 to 0.17.0 (#2654)

Bumps [ouroboros](https://github.com/joshua-maros/ouroboros) from 0.15.6
to 0.17.0.
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src/core/Cargo.toml

@@ -49,7 +49,7 @@ twox-hash = "1.6.0"
 vec-collections = "0.3.4"
 piz = "0.4.0"  # piz 0.5.1 requires Rust 1.63+
 memmap2 = "0.6.2"
-ouroboros = "0.15.6"
+ouroboros = "0.17.0"
 
 [dev-dependencies]
 assert_matches = "1.3.0"