fix(proto): use buf, like we do on dymension repo

[danwt]

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[0xbcdev]

@danwt the Makefile missed setting version to variables:
https://github.com/dymensionxyz/dymension/blob/983dd904dacc3b5a6ff5c3122b02fdbf450cd730/Makefile#L13-L20

The dependencies are not accurate either, rdk does not deps to Ethermint, Osmosis but still fetch proto?

dymension-rdk/Makefile

Lines 87 to 109 in f2d2ad1

	mkdir -p "$(THIRD_PARTY_DIR)/ethermint_tmp" && \
	cd "$(THIRD_PARTY_DIR)/ethermint_tmp" && \
	git init && \
	git remote add origin "https://github.com/dymensionxyz/ethermint.git" && \
	git config core.sparseCheckout true && \
	printf "proto\nthird_party\n" > .git/info/sparse-checkout && \
	git fetch --depth=1 origin "$(DEPS_ETHERMINT_VERSION)" && \
	git checkout FETCH_HEAD && \
	rm -f ./proto/buf.* && \
	mv ./proto/* ..
	rm -rf "$(THIRD_PARTY_DIR)/ethermint_tmp"
	mkdir -p "$(THIRD_PARTY_DIR)/osmosis_tmp" && \
	cd "$(THIRD_PARTY_DIR)/osmosis_tmp" && \
	git init && \
	git remote add origin "https://github.com/dymensionxyz/osmosis.git" && \
	git config core.sparseCheckout true && \
	printf "proto\nthird_party\n" > .git/info/sparse-checkout && \
	git fetch --depth=1 origin "$(DEPS_OSMOSIS_VERSION)" && \
	git checkout FETCH_HEAD && \
	rm -f ./proto/buf.* && \
	mv ./proto/* ..
	rm -rf "$(THIRD_PARTY_DIR)/osmosis_tmp"

[danwt]

@0xbcdev Thanks for pointing that out I was in a rush
I'll fix it

[danwt]

@0xbcdev please could you review #441
Thanks