Simplify custreamz and cudf_kafka recipes files (#10065)

Adding build string constraints with Python version is not required for `python-confluent-kafka` dependency as the python version is fixed during conda build with `--python` flag

Authors:
  - Jordan Jacobelli (https://github.com/Ethyling)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)

URL: #10065

conda/recipes/cudf_kafka/meta.yaml

@@ -35,7 +35,7 @@ requirements:
   run:
     - python
     - libcudf_kafka {{ version }}
-    - python-confluent-kafka >=1.7.0,<1.8.0a0=py{{ py_version_numeric }}*
+    - python-confluent-kafka >=1.7.0,<1.8.0a0
     - cudf {{ version }}
 
 test:                                   # [linux64]

conda/recipes/custreamz/meta.yaml

@@ -26,15 +26,15 @@ build:
 requirements:
   host:
     - python
-    - python-confluent-kafka >=1.7.0,<1.8.0a0=py{{ py_version_numeric }}*
+    - python-confluent-kafka >=1.7.0,<1.8.0a0
     - cudf_kafka {{ version }}
   run:
     - python
     - streamz
     - cudf {{ version }}
     - dask>=2021.11.1,<=2021.11.2
     - distributed>=2021.11.1,<=2021.11.2
-    - python-confluent-kafka >=1.7.0,<1.8.0a0=py{{ py_version_numeric }}*
+    - python-confluent-kafka >=1.7.0,<1.8.0a0
     - cudf_kafka {{ version }}
 
 test:                                   # [linux64]