Not able to install ruby for rbenv after MAC OS Big Sur update

I was using RVM initially and after MAC OS update to Big Sur, I not now able to install ruby either RVM and Rbenv.

I am getting following error:

rbenv install $LATEST_RUBY_VERSION
Downloading ruby-3.0.0.tar.gz...
-> https://cache.ruby-lang.org/pub/ruby/3.0/ruby-3.0.0.tar.gz
error: failed to download ruby-3.0.0.tar.gz

BUILD FAILED (macOS 11.1 using ruby-build 20210119)


As Big Sur OS using zsh terminal my .zshrc file is as follows:

# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH

# Path to your oh-my-zsh installation.
export ZSH="/Users/subratrout/.oh-my-zsh"

...
....

# alias zshconfig="mate ~/.zshrc"
# alias ohmyzsh="mate ~/.oh-my-zsh"
export PATH="/usr/local/opt/openjdk/bin:$PATH"
# export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"
# if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi
# export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"
# export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"
if which rbenv > /dev/null; then
  eval "$(rbenv init -)";
fi
export PATH="/usr/local/sbin:$PATH"

# Setup Compiler paths for readline and openssl
local READLINE_PATH=$(brew --prefix readline)
local OPENSSL_PATH=$(brew --prefix openssl@1.1)
export LDFLAGS="-L$READLINE_PATH/lib -L$OPENSSL_PATH/lib"
export CPPFLAGS="-I$READLINE_PATH/include -I$OPENSSL_PATH/include"
export PKG_CONFIG_PATH="$READLINE_PATH/lib/pkgconfig:$OPENSSL_PATH/lib/pkgconfig"

# Use the OpenSSL from Homebrew instead of ruby-build
# Note: the Homebrew version gets updated, the ruby-build version doesn't
# export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$OPENSSL_PATH"

# Place openssl@1.1 at the beginning of your PATH (preempt system libs)
export PATH=$OPENSSL_PATH/bin:$PATH

# Load rbenv
eval "$(rbenv init -)"

# Extract the latest version of Ruby so you can do this:
# rbenv install $LATEST_RUBY_VERSION
export LATEST_RUBY_VERSION=$(rbenv install -l | grep -v - | tail -1)

Also when I do:
curl -fsSL https://github.com/rbenv/rbenv-installer/raw/master/bin/rbenv-doctor | zsh

I am getting this error:

curl: (35) error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version

It was for these reasons I switched to ruby-install and chruby which I find to have fewer problems than the alternatives.