Remove 2.x from CI matrix

Author: ArtDu

.github/workflows/tests-ce.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        tarantool-version: [ "1.x", "2.10.6", "2.x" ]
+        tarantool-version: [ "1.x", "2.10.6"]
       fail-fast: false
     steps:
     - uses: actions/checkout@v2