Fix gcc_linux version pinning in dev environment (#10943)

As part of conda compiler migration #10275 we switched to `9.x`, this PR removed `9.3` requirement and switches it `9.x`. This is because the following error is seen some machines:
```
Encountered problems while solving.
Problem: package gcc_linux-64-9.3.0-h44160b2_26 requires gcc_impl_linux-64 9.3.0.*, but none of the providers can be installed
```

Upgrading to `9.4.0` on those machines works fine. CI too picks up `9.4.0`, for ex: https://gpuci.gpuopenanalytics.com/job/rapidsai/job/gpuci/job/cudf/job/prb/job/cudf-cpu-cuda-build-arm64/CUDA=11.5/4654/consoleText, hence fixes the broken dev environments.

Authors:
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Ashwin Srinath (https://github.com/shwina)
  - Jordan Jacobelli (https://github.com/Ethyling)

URL: #10943

conda/environments/cudf_dev_cuda11.5.yml

@@ -78,8 +78,8 @@ dependencies:
       - git+https://github.com/python-streamz/streamz.git@master
       - pyorc
   - ptxcompiler  # [linux64]
-  - gcc_linux-64=9.3.0 # [linux64]
+  - gcc_linux-64=9.* # [linux64]
   - sysroot_linux-64==2.17 # [linux64]
   # Un-comment following lines for ARM specific packages.
-  # - gcc_linux-aarch64=9.3.0 # [aarch64]
+  # - gcc_linux-aarch64=9.* # [aarch64]
   # - sysroot_linux-aarch64==2.17 # [aarch64]