update all uses of the docker image to 20.10

.gitlab-ci.yml

@@ -27,7 +27,7 @@ create the Gridded GLM buildbucket:
 
 create the Gridded GLM package:
   stage: gridded_glm_build
-  image: docker:19.03.1
+  image: docker:20.10
   tags:
     - docker
   services:
@@ -55,7 +55,7 @@ run tests:
 
 push our images with version tags:
   stage: release
-  image: docker:19.03.1
+  image: docker:20.10
   tags:
     - docker
   services:
@@ -75,7 +75,7 @@ push our images with version tags:
 
 push our images as latest tags:
   stage: release
-  image: docker:19.03.1
+  image: docker:20.10
   tags:
     - docker
   services: