Revert "Update to use 3.14 release" and "Update pyenv to 2.6.9"

This reverts commit c7fae91 and
b7e0aec.

3.14.0 was unable to build in CI so reverting ahead of a PR that adds
this new version with some additional testing.

Author: jb3

Dockerfile

@@ -29,7 +29,7 @@ RUN apt-get -y update \
         tk-dev \
     && rm -rf /var/lib/apt/lists/*
 
-RUN git clone -b v2.6.9 --depth 1 https://github.com/pyenv/pyenv.git $PYENV_ROOT
+RUN git clone -b v2.6.5 --depth 1 https://github.com/pyenv/pyenv.git $PYENV_ROOT
 
 COPY --link scripts/build_python.sh /
 
@@ -42,7 +42,7 @@ FROM builder-py-base AS builder-py-3_13t
 RUN /build_python.sh 3.13.2t
 # ------------------------------------------------------------------------------
 FROM builder-py-base AS builder-py-3_14
-RUN /build_python.sh 3.14.0
+RUN /build_python.sh 3.14.0rc1
 # ------------------------------------------------------------------------------
 FROM python:3.13-slim-bookworm AS base