feat: update cosmwasm/rust-optimizer to v0.14.0

[FranklinWaller]

Motivation

Contracts could not be deployed/build, because it was using v0.12.11 and we are using versions from a higher rust version.

Explanation of Changes

• Change pipelines to use v0.14.0 and modified the readme

Testing

The following command now builds:

docker run --rm -v $GITHUB_WORKSPACE:/code \
          --mount type=volume,source=contract_cache,target=/code/target \
          --mount type=volume,source=registry_cache,target=/usr/local/cargo/registry \
          cosmwasm/rust-optimizer:0.14.0

while the old gave:

error[E0658]: use of unstable library feature 'is_some_and'
   --> packages/staking/src/staking.rs:195:26
    |
195 |         if pending_owner.is_some_and(|owner| owner != info.sender) {
    |                          ^^^^^^^^^^^
    |
    = note: see issue #93050 <https://github.com/rust-lang/rust/issues/93050> for more information