ci: fix demo-rockylinux-9 builds (#10481)

Installing `curl` conflicts with a pre-installed `curl-minimal` package.
It seems that `curl-minimal` is all we need.

Author: coryan

ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile

@@ -25,7 +25,7 @@ RUN dnf makecache && \
     dnf update -y && \
     dnf install -y epel-release && \
     dnf makecache && \
-    dnf install -y ccache cmake curl findutils gcc-c++ git make openssl-devel \
+    dnf install -y ccache cmake findutils gcc-c++ git make openssl-devel \
         patch re2-devel zlib-devel libcurl-devel c-ares-devel tar wget which
 # ```
 

doc/packaging.md

@@ -1513,7 +1513,7 @@ sudo dnf makecache && \
 sudo dnf update -y && \
 sudo dnf install -y epel-release && \
 sudo dnf makecache && \
-sudo dnf install -y ccache cmake curl findutils gcc-c++ git make openssl-devel \
+sudo dnf install -y ccache cmake findutils gcc-c++ git make openssl-devel \
         patch re2-devel zlib-devel libcurl-devel c-ares-devel tar wget which
 ```