Migrate to Python 3.15

https://fedoraproject.org/wiki/Changes/Python3.15 just landed in ELN.

Author: yselkowitz

configs/rhel-pt-python--python-crb-eln.yaml

@@ -30,13 +30,12 @@ data:
     - python3-installer
     - python3-pyproject-hooks
     # update the following to the main Python version when it changes
-    # (for c11s we want this to be 3.15)
-    - python3.14-freethreading
-    - python3.14-freethreading-debug
-    - python3.14-freethreading-devel
-    - python3.14-freethreading-idle
-    - python3.14-freethreading-libs
-    - python3.14-freethreading-test
-    - python3.14-freethreading-tkinter
+    - python3.15-freethreading
+    - python3.15-freethreading-debug
+    - python3.15-freethreading-devel
+    - python3.15-freethreading-idle
+    - python3.15-freethreading-libs
+    - python3.15-freethreading-test
+    - python3.15-freethreading-tkinter
   labels:
     - eln

configs/rhel-pt-python--unwanted-python3-eln.yaml

@@ -9,6 +9,7 @@ data:
     # older Python versions
     - python3.12
     - python3.13
+    - python3.14
     # setuptools no longer needs this to build wheels
     # https://github.com/fedora-eln/eln/issues/284
     - python-wheel