Disable the arm64 job, it appears there are not enough runners. [skip ci]

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1923300 13f79535-47bb-0310-9956-ffa450edef68

Author: notroj

.github/workflows/linux.yml

@@ -50,9 +50,10 @@ jobs:
           - name: Shared MPMs, all-modules
             config: --enable-mods-shared=reallyall --enable-mpms-shared=all
           # -------------------------------------------------------------------------
-          - name: Shared MPMs, all-modules, 64-bit ARM
-            config: --enable-mods-shared=reallyall --enable-mpms-shared=all
-            os: ubuntu-22.04-arm64
+          ### uncomment this when there are enough arm64 runners
+          # - name: Shared MPMs, all-modules, 64-bit ARM
+          #  config: --enable-mods-shared=reallyall --enable-mpms-shared=all
+          #  os: ubuntu-22.04-arm64
           # -------------------------------------------------------------------------
           - name: Event MPM, all-modules, mod_cgid only
             config: --enable-mods-shared=reallyall --with-mpm=event --disable-cgi