build: increase timeouts for microbenchmark CI run groups

We've been hitting these limits due to some minor changes in the underlying
benchmarks in these groups. This ups the limit so the job doesn't time out.

Epic: None
Release note: None

Author: herkolategan

.github/workflows/microbenchmarks-ci.yaml

@@ -47,7 +47,7 @@ jobs:
           pkg: ${{ env.PACKAGE }}
   run-group-1:
     runs-on: [self-hosted, ubuntu_2004_microbench]
-    timeout-minutes: 60
+    timeout-minutes: 90
     needs: [base, head]
     steps:
       - name: Checkout
@@ -60,7 +60,7 @@ jobs:
           group: 1
   run-group-2:
     runs-on: [self-hosted, ubuntu_2004_microbench]
-    timeout-minutes: 60
+    timeout-minutes: 90
     needs: [base, head]
     steps:
       - name: Checkout