deps: drop msgpack-python support

msgpack-python package was deprecated in 2018 in favor of msgpack
package. After previous patch in the patchset, we require `Unpacker`
`tell` handle and msgpack-python 0.4.0 do not yet have it. It seems
to be no reason to support the package which is not supported for the
five years already, so we better drop it.

Author: DifferentialOrange

Diff for: .github/workflows/testing.yml

@@ -43,9 +43,6 @@ jobs:
         # "This page is taking too long to load." error. Thus we use
         # pairwise testing.
         include:
-          - tarantool: '2.11'
-            python: '3.11'
-            msgpack-deps: 'msgpack-python==0.4.0'
           - tarantool: '2.11'
             python: '3.11'
             msgpack-deps: 'msgpack==0.5.0'

Diff for: CHANGELOG.md

@@ -9,6 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Allow to require specific server protocol version and features (#267).
 
+### Changed
+- Drop `msgpack-python` support. Use `msgpack` instead.
+
 ### Fixed
 - Parsing of E-notation Tarantool decimals with positive exponent (PR #298).