Update GAP GitHub Actions: setup-gap@v3 + build-pkg-docs@v2

Author: fingolfin

.github/workflows/release.yml

@@ -23,10 +23,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: gap-actions/setup-gap@v2
-        with:
-          GAP_PKGS_TO_BUILD: json
-      - uses: gap-actions/build-pkg-docs@v1
+      - uses: gap-actions/setup-gap@v3
+      - uses: gap-actions/build-pkg-docs@v2
         with:
           use-latex: true
       - uses: gap-actions/release-pkg@v1