update ipykernel and make debugpy optional

 - update ipykernel to 6.6.0, for which debugpy is optional
 - patch out debugpy from pyproject.toml and setup.py
 - make debugpy optional for sagemath

build/pkgs/debugpy/type

@@ -1 +1 @@
-standard
+optional

build/pkgs/ipykernel/checksums.ini

@@ -1,5 +1,5 @@
 tarball=ipykernel-VERSION.tar.gz
-sha1=19b16c61057bb7f5ad97f7e91bb54cdfec260257
-md5=329c172babb38dff1be130ddf3a609af
-cksum=2936157099
+sha1=5a5cf7f8c0c02d0c0cc5fe3e0fe7481a86de6552
+md5=f940975eb00de793695c386ad3a8800c
+cksum=597841676
 upstream_url=https://pypi.io/packages/source/i/ipykernel/ipykernel-VERSION.tar.gz

build/pkgs/ipykernel/dependencies

@@ -1,4 +1,4 @@
-$(PYTHON) ipython_genutils importlib_metadata argcomplete debugpy matplotlib_inline ipython jupyter_client tornado appnope traitlets | $(PYTHON_TOOLCHAIN)
+$(PYTHON) ipython_genutils importlib_metadata argcomplete matplotlib_inline ipython jupyter_client tornado appnope traitlets | $(PYTHON_TOOLCHAIN)
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/ipykernel/package-version.txt

@@ -1 +1 @@
-6.3.1
+6.6.0

build/pkgs/ipykernel/patches/debugpy-make-optional.patch

@@ -0,0 +1,21 @@
+--- a/pyproject.toml	2021-12-01 10:23:30.000000000 -0300
++++ b/pyproject.toml	2021-12-13 18:01:36.239921204 -0300
+@@ -3,7 +3,6 @@
+ requires=[
+   "setuptools",
+   "wheel",
+-  "debugpy",
+   "ipython>=5",
+   "jupyter_core>=4.2",
+   "jupyter_client",
+diff -ruN a/setup.py b/setup.py
+--- a/setup.py	2021-12-01 10:23:09.000000000 -0300
++++ b/setup.py	2021-12-13 18:01:40.112873823 -0300
+@@ -63,7 +63,6 @@
+     install_requires=[
+         'importlib-metadata<5;python_version<"3.8.0"',
+         'argcomplete>=1.12.3;python_version<"3.8.0"',
+-        'debugpy>=1.0.0,<2.0',
+         'ipython>=7.23.1',
+         'traitlets>=5.1.0,<6.0',
+         'jupyter_client<8.0',