.github: pin codeql actions to latest 3.x (#13552)

Pin codeql actions usage to latest 3.x. These were previously pointing
to `@2` which pulls in the latest v2 as they are released, with the
potential to break our workflows if a breaking change or malicious
version on the `@2` stream is ever pushed.

Changing this to a pinned version also means that dependabot will keep
this in the pinend version format (e.g., referencing a SHA) when it
opens a PR to bump the dependency.

The breaking change between v2 and v3 is that v3 requires Node 20 which
is a non-issue as we are running this on ubuntu latest.

Updates #cleanup

Signed-off-by: Mario Minardi <mario@tailscale.com>

.github/workflows/codeql-analysis.yml

@@ -55,7 +55,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@294a9d92911152fe08befb9ec03e240add280cb3 # v3.26.8
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -66,7 +66,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      uses: github/codeql-action/autobuild@294a9d92911152fe08befb9ec03e240add280cb3 # v3.26.8
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -80,4 +80,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@294a9d92911152fe08befb9ec03e240add280cb3 # v3.26.8