chore: update gnupg version to 2.4.8 in release workflows

- update gnupg version in both qt5 and standard release workflows
- changed from version 2.4.7 to 2.4.8

Author: saturneric

.github/workflows/release-qt5.yml

@@ -39,7 +39,7 @@ on:
 
 env:
   BUILD_TYPE: Release
-  GNUPG_VERSION: "2.4.7"
+  GNUPG_VERSION: "2.4.8"
 
 jobs:
   build:

.github/workflows/release.yml

@@ -39,7 +39,7 @@ on:
 
 env:
   BUILD_TYPE: Release
-  GNUPG_VERSION: "2.4.7"
+  GNUPG_VERSION: "2.4.8"
 
 jobs:
   build: