feat(toolchains): update CPython 3.15.0 from rc1 to rc2 (#4199)

Make CPython 3.15.0rc2 available from the 20260929
python-build-standalone release.

Replace the 3.15.0rc1 runtime entries in the manifest with 3.15.0rc2
and update the default 3.15 minor version mapping.

news/update-cpython-3-15-rc2.changed.md

diff --git a/news/update-cpython-3-15-rc2.changed.md b/news/update-cpython-3-15-rc2.changed.md
new file mode 100644
index 0000000..b0c9a52
--- /dev/null
+++ b/news/update-cpython-3-15-rc2.changed.md
@@ -0,0 +1,2 @@
+(toolchain) Updated default Python 3.15 runtime from `3.15.0rc1` to
+`3.15.0rc2`.

python/private/runtimes_manifest.txt

diff --git a/python/private/runtimes_manifest.txt b/python/private/runtimes_manifest.txt
index a759cd9..493e0b8 100755
--- a/python/private/runtimes_manifest.txt
+++ b/python/private/runtimes_manifest.txt
@@ -607,31 +607,31 @@
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python/private/runtimes_manifest_workspace.bzl

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index eedaa65..69e55dd 100644
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 """

python/versions.bzl

diff --git a/python/versions.bzl b/python/versions.bzl
index 35939f1..f238f06 100644
--- a/python/versions.bzl
+++ b/python/versions.bzl
@@ -49,7 +49,7 @@
     "3.12": "3.12.13",
     "3.13": "3.13.13",
     "3.14": "3.14.4",
-    "3.15": "3.15.0rc1",
+    "3.15": "3.15.0rc2",
 }
 
 def _generate_platforms():

tests/support/mocks/python_ext.bzl

diff --git a/tests/support/mocks/python_ext.bzl b/tests/support/mocks/python_ext.bzl
index 419afe8..87d492c 100644
--- a/tests/support/mocks/python_ext.bzl
+++ b/tests/support/mocks/python_ext.bzl
@@ -111,7 +111,7 @@
 9999999999999999999999999999999999999999999999999999999999999999  20241016/cpython-3.13.0+20241016-x86_64-unknown-linux-gnu-install_only.tar.gz
 aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  20260414/cpython-3.14.4+20260414-x86_64-unknown-linux-gnu-install_only.tar.gz
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-cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  20260804/cpython-3.15.0rc1+20260804-x86_64-unknown-linux-gnu-install_only.tar.gz
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 dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd  20241205/cpython-3.13.1+20241205-x86_64-unknown-linux-gnu-install_only.tar.gz
 """