Update action versions (#6848)

In addition to the general updates, this switches to a required python
3.10 for pre-commit (3.9 is losing support from black).

Note endpoints for build actions are expanding significantly: see
https://app.stepsecurity.io/github/carbon-language/carbon-lang/actions/runs/22779388360?tab=recommendations&jobId=66080970460
for example, I think just the sources are being increased as a
side-effect of updates (and possibly also things not performing as well
as they should have before).

Similarly allowing sudo in pre-commit because it was actually causing
errors in part of build setup, which used sudo to remove files.

Assisted-by: Google Antigravity with Gemini

.github/workflows/pre_commit_suggestions.yaml

@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@17d0e2bd7d51742c71671bd19fa12bdc9d40a3d6 # v2.8.1
+        uses: step-security/harden-runner@58077d3c7e43986b6b15fba718e8ea69e387dfcc # v2.15.1
         with:
           disable-sudo: true
           egress-policy: block
@@ -48,10 +48,10 @@ jobs:
         with:
           reviewdog_version: latest
 
-      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Download pre-commit output
-        uses: actions/download-artifact@c850b930e6ba138125429b7e5c93fc707a7f8427 # v4.1.4
+        uses: actions/download-artifact@70fc10c6e5e1ce46ad2ea6f2b72d43f7d47b13c3 # v8.0.0
         with:
           name: pre-commit output
           github-token: ${{ secrets.GITHUB_TOKEN }}