pythonPackages36.{dm-sonnet, tensorflow-probability}: Use bazel 0.26 for building

* use the same bazel version as tensorflow 1
  (this makes using the `incompatible_disable_deprecated_attr_params` flag unnecessary)

pkgs/development/python-modules/dm-sonnet/default.nix

@@ -1,5 +1,6 @@
 { lib
 , fetchFromGitHub
+, bazel_0_26
 , buildBazelPackage
 , buildPythonPackage
 , git
@@ -19,6 +20,8 @@ let
 
   # first build all binaries and generate setup.py using bazel
   bazel-build = buildBazelPackage {
+    bazel = bazel_0_26;
+
     name = "dm-sonnet-bazel-${version}";
 
     src = fetchFromGitHub {
@@ -36,14 +39,9 @@ let
     bazelTarget = ":install";
 
     fetchAttrs = {
-      sha256 = "1dka5nap3d28n18pn3wp5xsi4x3z02h1j8rcjdvi3y6dbqjwdw0v";
+      sha256 = "09dzxs2v5wpiaxrz7qj257q1fbx0gxwbk0jyx58n81m5kys7yj9k";
     };
 
-    bazelFlags = [
-      # https://github.com/deepmind/sonnet/issues/134
-      "--incompatible_disable_deprecated_attr_params=false"
-    ];
-
     buildAttrs = {
       preBuild = ''
         patchShebangs .

pkgs/development/python-modules/tensorflow-probability/default.nix

@@ -1,6 +1,7 @@
 { lib
 , fetchFromGitHub
 , fetchpatch
+, bazel_0_26
 , buildBazelPackage
 , buildPythonPackage
 , python
@@ -26,6 +27,8 @@ let
 
   # first build all binaries and generate setup.py using bazel
   bazel-wheel = buildBazelPackage {
+    bazel = bazel_0_26;
+
     name = "${pname}-${version}-py2.py3-none-any.whl";
 
     src = fetchFromGitHub {