chore: update dependency git://git.savannah.gnu.org/libtool.git to v2.6.0

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Pkgfile

@@ -183,7 +183,7 @@ vars:
   libunistring_sha512: e0838b4324193aa927c6a3d647b9a482f12e11525d0cf2b5f0e6cf6b9afc9f2ee751d39d72e3c980bac3fc91e0d9d043c4a1c5662dde3cc26c52312d224d80f0
 
   # renovate: datasource=git-tags extractVersion=^v(?<version>.*)$ depName=git://git.savannah.gnu.org/libtool.git
-  libtool_version: 2.5.4
+  libtool_version: 2.6.0
   libtool_sha256: da8ebb2ce4dcf46b90098daf962cffa68f4b4f62ea60f798d0ef12929ede6adf
   libtool_sha512: 60599f5c3168a287fe3a35062fd2e32e0b73433fce820bfd18d28b0e3bd7a8fefde6d6f0505fbbc2d664119ab7c539269184993843289932c895847ea1ab9f04