gnu: stb: Update snapshot.

* gnu/packages/stb.scm (stb): Update to commit 2c2908f50515dcd.
(stb-image): Update to 2.22.
(stb-image-write): Update to 1.13.

gnu/packages/stb.scm

@@ -26,8 +26,8 @@
 (define stb
   ;; stb is a collection of libraries developed within the same repository.
   ;; When updating this, remember to change versions below as appropriate.
-  (let ((commit "e6afb9cbae4064da8c3e69af3ff5c4629579c1d2")
-        (revision "0"))
+  (let ((commit "2c2908f50515dcd939f24be261c3ccbcd277bb49")
+        (revision "1"))
     (package
       (name "stb")
       (home-page "https://github.com/nothings/stb")
@@ -39,7 +39,7 @@
                       (commit commit)))
                 (sha256
                  (base32
-                  "079nsn9bnb8c0vfq26g5l53q6gzx19a5x9q2nb55mpcljxsgxnmf"))
+                  "1z753rscqc4clp0rd57bw68i60kz694y1z52bwv6slzmkgds1cki"))
                 (file-name (git-file-name name version))))
       (build-system gnu-build-system)
       (arguments
@@ -92,12 +92,12 @@ the C programming language.")
 ;; converted to macros as outlined in <https://bugs.gnu.org/32155>.
 (define-public stb-image
   (make-stb-header-package
-   "stb-image" "2.19"
+   "stb-image" "2.22"
    "stb-image is a small and self-contained library for image loading or
 decoding from file or memory.  A variety of formats are supported."))
 
 (define-public stb-image-write
   (make-stb-header-package
-   "stb-image-write" "1.09"
+   "stb-image-write" "1.13"
    "stb-image-write is a small library for writing image files to the
 C@tie{}@code{stdio} interface."))