tcllib: update to 1.21.

Closes: #39822 [via git-merge-pr]

srcpkgs/tcllib/template

@@ -1,7 +1,7 @@
 # Template file for 'tcllib'
 pkgname=tcllib
-version=1.20
-revision=2
+version=1.21
+revision=1
 wrksrc="tcllib-tcllib-${version/./-}"
 build_style=gnu-configure
 hostmakedepends="pkg-config tcl"
@@ -9,9 +9,10 @@ depends="tcl"
 short_desc="Set of pure-Tcl extensions"
 maintainer="Farhad Shahbazi <grauwolf@geekosphere.org>"
 license="TCL"
-homepage="http://core.tcl.tk/tcllib/"
+homepage="https://core.tcl.tk/tcllib/"
+changelog="https://core.tcl-lang.org/tcllib/doc/tcllib-${version/./-}/support/releases/history/README-${version}.txt"
 distfiles="https://github.com/tcltk/${pkgname}/archive/${pkgname}-${version/./-}.tar.gz"
-checksum=076daf919ba0f8964dacb86ae974a6992db4d874eb738dffec1e1efebbd6d080
+checksum=c939b06b3383480a293d6d3cec9af91491e8a38aa3571dfb5024fbf0db260bbd
 
 post_install() {
 	vlicense ./license.terms LICENSE