Merge pull request #321 from orocos/pybind/v2.6.2

Update PyBind11 to v2.6.2

Author: MatthijsBurgh

.github/workflows/main.yml

@@ -10,6 +10,7 @@ jobs:
     name: Build
     runs-on: ubuntu-18.04
     strategy:
+      fail-fast: false
       matrix:
         orocos_build_type: [Debug, Release]
         compiler: [gcc, clang]

.gitmodules

@@ -1,4 +1,4 @@
 [submodule "python_orocos_kdl/pybind11"]
     path = python_orocos_kdl/pybind11
     url = https://github.com/pybind/pybind11.git
-    branch = v2.6.0
+    branch = v2.6.2