feat: Update to gap-4.15.0 (#126)

Author: james-d-mitchell

.github/workflows/main.yaml

@@ -34,7 +34,7 @@ jobs:
         id: matrix
         run: |
           echo 'systems=["ubuntu-2204-lts"]' >> "$GITHUB_OUTPUT"
-          echo 'versions=["4.14.0", "4.13.1", "4.13.0", "4.12.2", "4.12.1", "4.12.0"]' >> "$GITHUB_OUTPUT"
+          echo 'versions=["4.15.1", "4.15.0", "4.14.0", "4.13.1", "4.13.0", "4.12.2", "4.12.1", "4.12.0"]' >> "$GITHUB_OUTPUT"
 
   bare:
     needs:

src/dockerfiles/gap/ubuntu-2204-lts/Dockerfile

@@ -1,6 +1,6 @@
 ## {{{
-ARG GAP_VERSION="4.14.0"
-ARG PACKAGE_MANAGER_VERSION="1.6.2"
+ARG GAP_VERSION="4.15.1"
+ARG PACKAGE_MANAGER_VERSION="1.6.3"
 ## }}}
 
 ## {{{