patch 9.0.1553: CI: using slightly outdated gcc version

Problem:    CI: using slightly outdated gcc version.
Solution:   Use "brew" to get a more recent gcc version.  (closes #12391)
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1c51507..bd903dc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -98,9 +98,10 @@
       - name: Install gcc-${{ env.GCC_VER }}
         if:  matrix.compiler == 'gcc'
         run: |
-          sudo apt-get install -y gcc-${{ env.GCC_VER }}
-          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-${{ env.GCC_VER }} 100
-          sudo update-alternatives --set gcc /usr/bin/gcc-${{ env.GCC_VER }}
+          eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+          brew install gcc@${{ env.GCC_VER }}
+          sudo update-alternatives --install /usr/bin/gcc gcc /home/linuxbrew/.linuxbrew/bin/gcc-${{ env.GCC_VER }} 100
+          sudo update-alternatives --set gcc /home/linuxbrew/.linuxbrew/bin/gcc-${{ env.GCC_VER }}
 
       - name: Install clang-${{ env.CLANG_VER }}
         if: matrix.compiler == 'clang'
diff --git a/src/version.c b/src/version.c
index 2f2fa12..ed51a81 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1553,
+/**/
     1552,
 /**/
     1551,