[CI] Reduce GHA timeouts from 6h default (#14704)

* [CI] Reduce GHA timeouts from 6h default

The goal here is to never interfere with a real run (so most of the
timeout-minutes values seem rather high) but to avoid having 6h long
runs if something goes crazy and never ends.

Signed-off-by: Rick Elrod <rick@elrod.me>

* Do bash hackery instead

Signed-off-by: Rick Elrod <rick@elrod.me>

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Signed-off-by: Rick Elrod <rick@elrod.me>

.github/workflows/update_dependabot_prs.yml

@@ -9,6 +9,7 @@ jobs:
     name: Update Dependabot Prs
     if:  contains(github.event.pull_request.labels.*.name, 'dependencies') && contains(github.event.pull_request.labels.*.name, 'component:ui')
     runs-on: ubuntu-latest
+    timeout-minutes: 20
 
     steps:
       - name: Checkout branch