対話式にファイルをバージョンのデフォルト状態に修正するかを選択できます。dでdiff、差分を確認できるので確認してy or nで回答していきます。
私の場合は参考にしている伊藤さんが「rails app:updateコマンドのdiffでざっと確認してy、そのあと改めて確認して適宜修正」という流れで作業しているとのことで参考にしています。
$ rbenv install 3.3.0
ruby-build: using openssl@3 from homebrew
==> Downloading ruby-3.3.0.tar.gz...
-> curl -q -fL -o ruby-3.3.0.tar.gz https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.0.tar.gz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 21.0M 100 21.0M 0 0 17.2M 0 0:00:01 0:00:01 --:--:-- 17.5M
==> Installing ruby-3.3.0...
ruby-build: using libyaml from homebrew
ruby-build: using gmp from homebrew
-> ./configure "--prefix=$HOME/.rbenv/versions/3.3.0" --with-openssl-dir=/usr/local/opt/openssl@3 --enable-shared --with-libyaml-dir=/usr/local/opt/libyaml --with-gmp-dir=/usr/local/opt/gmp --with-ext=openssl,psych,+
-> make -j 8
BUILD FAILED (macOS 14.1.2 on x86_64 using ruby-build 20240119)
You can inspect the build directory at /var/folders/2p/jld6b7mn5n74dp5r5ydkx3_40000gn/T/ruby-build.20240220010937.52845.wnLlSZ
See the full build log at /var/folders/2p/jld6b7mn5n74dp5r5ydkx3_40000gn/T/ruby-build.20240220010937.52845.log
$ rbenv install 3.3.0
ruby-build: using openssl@3 from homebrew
==> Downloading ruby-3.3.0.tar.gz...
-> curl -q -fL -o ruby-3.3.0.tar.gz https://cache.ruby-lang.org/pub/ruby/3.3/ruby-3.3.0.tar.gz
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 21.0M 100 21.0M 0 0 25.2M 0 --:--:-- --:--:-- --:--:-- 25.4M
==> Installing ruby-3.3.0...
ruby-build: using libyaml from homebrew
ruby-build: using gmp from homebrew
-> ./configure "--prefix=$HOME/.rbenv/versions/3.3.0" --with-openssl-dir=/usr/local/opt/openssl@3 --enable-shared --with-libyaml-dir=/usr/local/opt/libyaml --with-gmp-dir=/usr/local/opt/gmp --with-ext=openssl,psych,+
-> make -j 8
-> make install
==> Installed ruby-3.3.0 to /Users/nabeyu/.rbenv/versions/3.3.0