build: don't pin rustdoc versions

The docs builds often fail if we bump dependencies and don't update the
rustdocs build script to match. Let's stop pinning specific versions
unless we have an express need to do so. Trusting Cargo.lock to
determine which docs versions are built is fine for our needs.

deployments/scripts/rust-docs

@@ -18,8 +18,8 @@ export RUSTDOCFLAGS="--enable-index-page -Zunstable-options --cfg docsrs"
 # indexes is overwritten on each cargo doc invocation.
 
 cargo +nightly doc --no-deps \
-  -p tendermint@0.32.0 \
-  -p tendermint-config@0.32.0 \
+  -p tendermint \
+  -p tendermint-config \
   -p ibc-types \
   -p tower-abci \
   -p jmt \