Remove support for 3.6 (#853)

.github/workflows/test.yml

@@ -6,31 +6,30 @@ on:
     - 'release/*'
   pull_request:
 env:
-  CORE_REPO_SHA: ece57231cde5bb5656775a62f027cab0b1c76fce
+  CORE_REPO_SHA: b3b0ba3a47dbdd844b524c46db22a60549364071
 
 jobs:
   build:
     env:
       # We use these variables to convert between tox and GHA version literals
-      py36: 3.6
       py37: 3.7
       py38: 3.8
       py39: 3.9
       py310: "3.10"
-      pypy3: pypy3
+      pypy3: "pypy3.7"
       RUN_MATRIX_COMBINATION: ${{ matrix.python-version }}-${{ matrix.package }}-${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false  # ensures the entire test matrix is run, even if one permutation fails
       matrix:
-        python-version: [ py36, py37, py38, py39, py310, pypy3 ]
+        python-version: [ py37, py38, py39, py310, pypy3 ]
         package: ["instrumentation", "distro", "exporter", "sdkextension", "propagator"]
         os: [ ubuntu-20.04 ]
     steps:
       - name: Checkout Contrib Repo @ SHA - ${{ github.sha }}
         uses: actions/checkout@v2
       - name: Set up Python ${{ env[matrix.python-version] }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ env[matrix.python-version] }}
       - name: Install tox