tcl/tk: upgrade from 8.6.12 -> 8.6.14

Let's stay modern.

Should address #296.

Author: zanieb

cpython-unix/build.py

@@ -905,7 +905,7 @@ def build_cpython(
             "itcl4.2.4",
             "tcl8",
             "tcl8.6",
-            "thread2.8.7",
+            "thread2.8.79",
             "tk8.6",
         ]
 

pythonbuild/downloads.py

@@ -342,31 +342,6 @@
         "size": 9497943,
         "sha256": "9b8e77d55f40ceaedd140ccca0daa804f0d43346d5abfcead9b547b5590f82f8",
         "version": "8.6.14",
-        "git_commit": "c624cc881bd0e5071dec9de4b120cbe9985d8c14",
-    },
-    "tcl-8612": {
-        "url": "https://prdownloads.sourceforge.net/tcl/tcl8.6.12-src.tar.gz",
-        "size": 10353486,
-        "sha256": "26c995dd0f167e48b11961d891ee555f680c175f7173ff8cb829f4ebcde4c1a6",
-        "version": "8.6.12",
-        "library_names": ["tcl8.6"],
-        "licenses": ["TCL"],
-        "license_file": "LICENSE.tcl.txt",
-    },
-    "tk-8612": {
-        "url": "https://prdownloads.sourceforge.net/tcl/tk8.6.12-src.tar.gz",
-        "size": 4515393,
-        "sha256": "12395c1f3fcb6bed2938689f797ea3cdf41ed5cb6c4766eec8ac949560310630",
-        "version": "8.6.12",
-        "library_names": ["tk8.6"],
-        "licenses": ["TCL"],
-        "license_file": "LICENSE.tcl.txt",
-    },
-    "tk-windows-bin-8612": {
-        "url": "https://github.com/python/cpython-bin-deps/archive/e3c3e9a2856124aa32b608632a52742d479eb7a9.tar.gz",
-        "size": 6787654,
-        "sha256": "01ad9c663659224e075d487cbc33ea2fed7a225593965b79bed92ca7f79b676f",
-        "version": "8.6.12",
         "git_commit": "e3c3e9a2856124aa32b608632a52742d479eb7a9",
     },
     "uuid": {