Remove Python v3.7 from github workflow test matrix (elyra-ai#3098)

Signed-off-by: Patrick Titzler <[email protected]>

Author: ptitzler

.github/workflows/build.yml

@@ -78,7 +78,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
@@ -183,7 +183,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
     steps:
       - uses: actions/checkout@v3
       - name: Validate image environment