Hardcode Github action actions/stale version to v3.0.8

[antoninbas]

Because of this issue: actions/stale#173,
which is preventing the removal of the stale label when the issue
receives a new comment.

This commit also increases operations-per-run to 200, since we are
starting to have a decent amount of open issues and it seems we keep
running into the current limit (30).

[antrea-bot]

Thanks for your PR.
Unit tests and code linters are run automatically every time the PR is updated.
E2e, conformance and network policy tests can only be triggered by a member of the vmware-tanzu organization. Regular contributors to the project should join the org.

The following commands are available:

• /test-e2e: to trigger e2e tests.
• /skip-e2e: to skip e2e tests.
• /test-conformance: to trigger conformance tests.
• /skip-conformance: to skip conformance tests.
• /test-whole-conformance: to trigger all conformance tests on linux.
• /skip-whole-conformance: to skip all conformance tests on linux.
• /test-networkpolicy: to trigger networkpolicy tests.
• /skip-networkpolicy: to skip networkpolicy tests.
• /test-windows-conformance: to trigger windows conformance tests.
• /skip-windows-conformance: to skip windows conformance tests.
• /test-windows-networkpolicy: to trigger windows networkpolicy tests.
• /skip-windows-networkpolicy: to skip windows networkpolicy tests.
• /test-hw-offload: to trigger ovs hardware offload test.
• /skip-hw-offload: to skip ovs hardware offload test.
• /test-all: to trigger all tests (except whole conformance).
• /skip-all: to skip all tests (except whole conformance).

[codecov-io]

Codecov Report

Merging #1346 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1346      +/-   ##
==========================================
- Coverage   64.42%   64.36%   -0.07%     
==========================================
  Files         159      159              
  Lines       12674    12674              
==========================================
- Hits         8165     8157       -8     
- Misses       3656     3665       +9     
+ Partials      853      852       -1     

Flag	Coverage Δ
#integration-tests	44.83% <ø> (ø)
#kind-e2e-tests	50.23% <ø> (-0.45%)	⬇️
#unit-tests	42.09% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/apis/controlplane/v1beta1/sets.go	39.70% <0.00%> (-4.42%)	⬇️
...ntroller/networkpolicy/networkpolicy_controller.go	65.92% <0.00%> (-2.23%)	⬇️
pkg/apiserver/storage/ram/store.go	78.94% <0.00%> (-1.51%)	⬇️
pkg/controller/traceflow/controller.go	61.29% <0.00%> (-1.30%)	⬇️
pkg/apiserver/certificate/certificate.go	77.63% <0.00%> (+6.57%)	⬆️

[antoninbas]

/skip-all