Add 3.13.0b3t and exclude it from `pyenv latest`.

This adds the free-threaded (without GIL) version of 3.13.0b3.

libexec/pyenv-latest

@@ -50,7 +50,7 @@ IFS=$'\n'
 
     DEFINITION_CANDIDATES=(\
         $(printf '%s\n' "${DEFINITION_CANDIDATES[@]}" | \
-          sed -E -e '/-dev$/d' -e '/-src$/d' -e '/-latest$/d' -e '/(a|b|rc)[0-9]+$/d'));
+          sed -E -e '/-dev$/d' -e '/-src$/d' -e '/-latest$/d' -e '/(a|b|rc)[0-9]+$/d' -e '/t$/d'));
 
     # Compose a sorting key, followed by | and original value
     DEFINITION_CANDIDATES=(\

plugins/python-build/share/python-build/3.13.0b3t

@@ -0,0 +1,2 @@
+export PYTHON_BUILD_FREE_THREADING=1
+source "$(dirname "${BASH_SOURCE[0]}")"/3.13.0b3

pyenv.d/install/latest.bash

@@ -10,7 +10,7 @@ pyenv_install_resolve_latest() {
       $(python-build --definitions | \
         grep -F "${DEFINITION_PREFIX}" | \
         grep "^${DEFINITION_TYPE}" | \
-        sed -E -e '/-dev$/d' -e '/-src$/d' -e '/(b|rc)[0-9]+$/d' | \
+        sed -E -e '/-dev$/d' -e '/-src$/d' -e '/(b|rc)[0-9]+$/d' -e '/t$/d' | \
         sort -t. -k1,1r -k 2,2nr -k 3,3nr \
       || true))
     DEFINITION="${DEFINITION_CANDIDATES}"