chore(deps): update dependency modules/gettext to v0.26 (#2197)

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

Author: renovate[bot]

.gitmodules

@@ -1,7 +1,7 @@
 [submodule "modules/gettext"]
 	path = modules/gettext
 	url = https://github.com/autotools-mirror/gettext.git
-    branch = v0.25
+	branch = v0.26
 [submodule "modules/iso-codes"]
 	path = modules/iso-codes
 	url = https://salsa.debian.org/iso-codes-team/iso-codes.git