Group codeql-action Dependabot updates and bump to v4.36.3

Dependabot opened separate PRs for the init and analyze sub-actions,
leaving them on mismatched versions. The analyze step refuses to run
when its version differs from the config written by init, so neither
PR could pass CI. Grouping the updates keeps both pins in lockstep.

Author: ericmj

.github/dependabot.yml

@@ -6,6 +6,10 @@ updates:
       interval: "weekly"
     cooldown:
       default-days: 7
+    groups:
+      codeql:
+        patterns:
+          - "github/codeql-action*"
 
   - package-ecosystem: "mix"
     directory: "/"

.github/workflows/codeql.yml

@@ -29,12 +29,12 @@ jobs:
         with:
           persist-credentials: false
       - name: Initialize CodeQL
-        uses: github/codeql-action/init@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        uses: github/codeql-action/init@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
         with:
           languages: ${{ matrix.language }}
           build-mode: ${{ matrix.build-mode }}
       - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@8aad20d150bbac5944a9f9d289da16a4b0d87c1e # v4.36.2
+        uses: github/codeql-action/analyze@54f647b7e1bb85c95cddabcd46b0c578ec92bc1a # v4.36.3
         with:
           category: "/language:${{matrix.language}}"