fix: grant actions permission to native-lib-update-check.yml callers

The reusable workflow's pr/wait-for-required-checks jobs request
actions: write/read, but the three callers only granted contents and
pull-requests, so GitHub rejected the whole run at startup.

Author: lucf15

.github/workflows/libjpeg-update-check.yml

@@ -12,6 +12,7 @@ concurrency:
 permissions:
   contents: write
   pull-requests: write
+  actions: write
 
 jobs:
   update-check:

.github/workflows/libtiff-update-check.yml

@@ -12,6 +12,7 @@ concurrency:
 permissions:
   contents: write
   pull-requests: write
+  actions: write
 
 jobs:
   update-check:

.github/workflows/libwebp-update-check.yml

@@ -12,6 +12,7 @@ concurrency:
 permissions:
   contents: write
   pull-requests: write
+  actions: write
 
 jobs:
   update-check: