chore: update dash_hash install and instructions (#5291)

## Issue being fixed or feature implemented
Install of dash_hash will change once
https://github.com/dashpay/dash_hash/pull/17/ is merged

## What was done?
- Changed install instructions to match new install in dash_hash README
- Updated Dockerfile to install correctly

## How Has This Been Tested?
N/A

## Breaking Changes
None

## Checklist:
<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [x] I have made corresponding changes to the documentation

contrib/containers/ci/Dockerfile

@@ -45,7 +45,7 @@ RUN pip3 install \
 # dash_hash
 ARG DASH_HASH_VERSION=1.4.0
 RUN git clone --depth 1 --no-tags --branch=${DASH_HASH_VERSION} https://github.com/dashpay/dash_hash
-RUN cd dash_hash && python3 setup.py install
+RUN cd dash_hash && pip3 install -r requirements.txt .
 
 ARG USER_ID=1000
 ARG GROUP_ID=1000

test/README.md

@@ -27,7 +27,7 @@ Before tests can be run locally, Dash Core must be built.  See the [building ins
 Many Dash specific tests require dash_hash. To install it:
 
 - Clone the repo `git clone https://github.com/dashpay/dash_hash`
-- Install dash_hash `cd dash_hash && python3 setup.py install`
+- Install dash_hash `cd dash_hash && pip3 install -r requirements.txt .`
 
 The ZMQ functional test requires a python ZMQ library. To install it: