temporarily turn off Python + tbb in CI because of OOM

.github/workflows/build-python.yml

@@ -22,7 +22,7 @@ jobs:
           ubuntu-18.04-gcc-9,
           ubuntu-18.04-clang-9,
           macOS-10.15-xcode-11.3.1,
-          ubuntu-18.04-gcc-5-tbb,
+          #ubuntu-18.04-gcc-5-tbb,
         ]
 
         build_type: [Debug, Release]
@@ -48,11 +48,11 @@ jobs:
             compiler: xcode
             version: "11.3.1"
 
-          - name: ubuntu-18.04-gcc-5-tbb
-            os: ubuntu-18.04
-            compiler: gcc
-            version: "5"
-            flag: tbb
+#           - name: ubuntu-18.04-gcc-5-tbb
+#             os: ubuntu-18.04
+#             compiler: gcc
+#             version: "5"
+#             flag: tbb
 
     steps:
       - name: Checkout