Downgrade to tensorflow 2.4

bob/devtools/data/conda_build_config.yaml

@@ -334,13 +334,13 @@ package_names_map:
 boost:
   - 1.76.0
 click:
-  - 8.0.1
+  - 8.0.3
 click_plugins:
   - 1.1.1
 cmake:
   - 3.21.3
 coverage:
-  - 6.0
+  - 6.0.2
 dask:
   - 2021.9.1
 dask_jobqueue:
@@ -352,11 +352,11 @@ ddt:
 distributed:
   - 2021.9.1
 docker_py:
-  - 5.0.2
+  - 5.0.3
 docopt:
   - 0.6.2
 ffmpeg:
-  - 4.3.2
+  - 4.4.0
 flaky:
   - 3.7.0
 font_ttf_dejavu_sans_mono:
@@ -368,11 +368,11 @@ giflib:
 graphviz:
   - 2.49.1
 h5py:
-  - 3.1.0
+  - 2.10.0
 hdf5:
   - 1.10.6
 jinja2:
-  - 3.0.1
+  - 3.0.2
 jpeg:
   - 9d
 jsonschema:
@@ -394,9 +394,9 @@ ncurses:
 nose:
   - 1.3.7
 numba:
-  - 0.54.0
+  - 0.54.1
 numpy:
-  - 1.19.5
+  - 1.20.3
 opencv:
   - 4.5.1
 pandas:
@@ -404,7 +404,7 @@ pandas:
 pillow:
   - 8.3.2
 pip:
-  - 21.2.4
+  - 21.3
 pkg_config:
   - 0.29.2
 psutil:
@@ -438,11 +438,11 @@ scikit_learn:
 scipy:
   - 1.7.1
 setuptools:
-  - 58.0.4
+  - 58.2.0
 simplejson:
   - 3.17.5
 six:
-  - 1.15.0
+  - 1.16.0
 sox:
   - 14.4.2
 sphinx:
@@ -460,7 +460,7 @@ sqlalchemy:
 tabulate:
   - 0.8.9
 tensorflow:
-  - 2.6.0
+  - 2.4.1
 termcolor:
   - 1.1.0
 torchvision: