update rapids-dependency-file-generator, allow it to float (#912)

Fixes #911

NVIDIA/cudf#23556 and PRs like it getting merged means that this project needs to use a newer `rapids-dependency-file-generator`.

This proposes:

* bumping the floor to `1.22` (the first version with the necessary changes: rapidsai/dependency-file-generator#197)
* allowing `rapids-dependency-file-generator` to float within `1.*`

Authors:
  - James Lamb (https://github.com/jameslamb)

Approvers:
  - Gil Forsyth (https://github.com/gforsyth)

URL: #912

Author: jameslamb

Dockerfile

@@ -39,7 +39,7 @@ apt-get install -y --no-install-recommends \
 
 PACKAGES_TO_INSTALL=(
   'conda-merge==0.3.*'
-  'rapids-dependency-file-generator==1.20.*'
+  'rapids-dependency-file-generator==1.*,>=1.22'
 )
 python -m pip install --no-cache-dir --prefer-binary --upgrade \
   "${PACKAGES_TO_INSTALL[@]}"