[CI][R] Remove clang-22 install from test-r-linux-as-cran

Describe the bug, including details regarding any error messages, version, and platform.

test-r-linux-as-cran has failed since 2026-10-20 (https://github.com/ursacomputing/crossbow/actions/runs/40825131742).

The R_UPDATE_CLANG step in ci/scripts/r_docker_configure.sh installs clang-22 from the jammy LLVM repo (

arrow/ci/scripts/r_docker_configure.sh

Lines 94 to 109 in 3f1fd72

    
           # Update clang version to latest available. 
        
           # The rhub/ubuntu-clang image ships clang-15 but CRAN's debian-clang now uses 
        
           # clang 22. Install clang-22 from LLVM's apt repos to match. 
        
           if [ "$R_UPDATE_CLANG" = true ]; then 
        
             apt-get update -y --allow-releaseinfo-change 
        
             apt-get install -y gnupg 
        
             curl -fsSL https://apt.llvm.org/llvm-snapshot.gpg.key | gpg --dearmor -o /etc/apt/trusted.gpg.d/llvm.gpg 
        
             echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-22 main" > /etc/apt/sources.list.d/llvm22.list 
        
             apt-get update -y --allow-releaseinfo-change 
        
             apt-get install -y clang-22 lld-22 
        
             # The rhub image hardcodes clang-15/clang++-15 in R's Makeconf, so installing 
        
             # clang-22 alone isn't enough: point R at the new compilers. 
        
             sed -i 's/clang++-15/clang++-22/g; s/clang-15/clang-22/g' "$(R RHOME)/etc/Makeconf" 
        
             echo "R is now using CC=$(R CMD config CC) CXX=$(R CMD config CXX)" 
        
             clang-22 --version 
        
           fi

). The rhub/ubuntu-clang image now ships clang 23 on Ubuntu 26.04, matching CRAN's debian-clang, and the jammy clang-22 packages can't be installed there (libxml2 was renamed to libxml2-16).

Remove the R_UPDATE_CLANG block and its plumbing in dev/tasks/r/github.linux.cran.yml, compose.yaml and ci/docker/linux-r.dockerfile.

This issue was drafted with the help of an AI assistant.

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[CI][R] Remove clang-22 install from test-r-linux-as-cran #55332

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	# Update clang version to latest available.
	# The rhub/ubuntu-clang image ships clang-15 but CRAN's debian-clang now uses
	# clang 22. Install clang-22 from LLVM's apt repos to match.
	if [ "$R_UPDATE_CLANG" = true ]; then
	apt-get update -y --allow-releaseinfo-change
	apt-get install -y gnupg
	curl -fsSL https://apt.llvm.org/llvm-snapshot.gpg.key \| gpg --dearmor -o /etc/apt/trusted.gpg.d/llvm.gpg
	echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy-22 main" > /etc/apt/sources.list.d/llvm22.list
	apt-get update -y --allow-releaseinfo-change
	apt-get install -y clang-22 lld-22
	# The rhub image hardcodes clang-15/clang++-15 in R's Makeconf, so installing
	# clang-22 alone isn't enough: point R at the new compilers.
	sed -i 's/clang++-15/clang++-22/g; s/clang-15/clang-22/g' "$(R RHOME)/etc/Makeconf"
	echo "R is now using CC=$(R CMD config CC) CXX=$(R CMD config CXX)"
	clang-22 --version
	fi

[CI][R] Remove clang-22 install from test-r-linux-as-cran #55332

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