update building latest XLA 1.8 (#7359)

* wip

* XLA

* .

Author: Borda

.github/workflows/ci_dockers.yml

@@ -23,8 +23,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python_version: [3.6]
-        pytorch_version: [1.4, 1.7]
+        python_version: [3.7]
+        pytorch_version: [1.4, 1.8]
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -46,7 +46,7 @@ jobs:
       fail-fast: false
       matrix:
         python_version: [3.7]
-        xla_version: [1.6, 1.7, "nightly"]
+        xla_version: [1.6, 1.8, "nightly"]
     steps:
       - name: Checkout
         uses: actions/checkout@v2

.github/workflows/events-nightly.yml

@@ -47,8 +47,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python_version: [3.6, 3.7]
-        xla_version: [1.6, 1.7] # todo: , "nightly"
+        python_version: [3.7]
+        xla_version: [1.6, 1.7, 1.8] # todo: , "nightly"
     steps:
       - name: Checkout
         uses: actions/checkout@v2