ci: add Runtime Upgrade MR template

.gitlab/merge_request_templates/Runtime Upgrade.md

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+## Runtime Upgrade — Summary
+
+<!-- What runtime changes does this include? -->
+
+## Spec Version
+
+- Previous: `spec_version = `
+- New: `spec_version = `
+
+## Migration
+
+- [ ] No storage migration required
+- [ ] Storage migration included and tested
+- [ ] try-runtime migration check passes
+
+## Pallets Changed
+
+<!-- List affected pallets -->
+
+## Benchmarks
+
+- [ ] Benchmarks updated (`cargo run --release -p pezkuwi benchmark pallet ...`)
+- [ ] Weights regenerated
+
+## Testing
+
+- [ ] Tested on Zagros testnet
+- [ ] Runtime migration check: `./try-runtime on-runtime-upgrade`
+
+## Checklist
+
+- [ ] `spec_version` bumped
+- [ ] `impl_version` bumped if applicable
+- [ ] CHANGELOG.md updated
+- [ ] Breaking API changes documented
+
+/label ~T-runtime
+/assign me
+