bop-43652: Update Tcl and Tk to 8.6.11 in Windows installer (GH-25170)

Misc/NEWS.d/next/Windows/2021-04-03-18-54-31.bpo-43652.gNmfVN.rst

@@ -0,0 +1 @@
+Update Tcl and Tk to 8.6.11 in Windows installer.

PCbuild/get_externals.bat

@@ -55,8 +55,8 @@ set libraries=%libraries%                                       bzip2-1.0.6
 if NOT "%IncludeLibffiSrc%"=="false" set libraries=%libraries%  libffi
 if NOT "%IncludeSSLSrc%"=="false" set libraries=%libraries%     openssl-1.1.1k
 set libraries=%libraries%                                       sqlite-3.34.0.0
-if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tcl-core-8.6.10.0
-if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tk-8.6.10.0
+if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tcl-core-8.6.11.0
+if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tk-8.6.11.0
 if NOT "%IncludeTkinterSrc%"=="false" set libraries=%libraries% tix-8.4.3.6
 set libraries=%libraries%                                       xz-5.2.2
 set libraries=%libraries%                                       zlib-1.2.11
@@ -78,7 +78,7 @@ echo.Fetching external binaries...
 set binaries=
 if NOT "%IncludeLibffi%"=="false"  set binaries=%binaries% libffi
 if NOT "%IncludeSSL%"=="false"     set binaries=%binaries% openssl-bin-1.1.1k-1
-if NOT "%IncludeTkinter%"=="false" set binaries=%binaries% tcltk-8.6.10.0
+if NOT "%IncludeTkinter%"=="false" set binaries=%binaries% tcltk-8.6.11.0
 if NOT "%IncludeSSLSrc%"=="false"  set binaries=%binaries% nasm-2.11.06
 
 for %%b in (%binaries%) do (

PCbuild/tcltk.props

@@ -4,7 +4,7 @@
   <PropertyGroup>
     <TclMajorVersion>8</TclMajorVersion>
     <TclMinorVersion>6</TclMinorVersion>
-    <TclPatchLevel>10</TclPatchLevel>
+    <TclPatchLevel>11</TclPatchLevel>
     <TclRevision>0</TclRevision>
     <TkMajorVersion>$(TclMajorVersion)</TkMajorVersion>
     <TkMinorVersion>$(TclMinorVersion)</TkMinorVersion>