docs: update contributing guide to rebase of origin/master not local master branch

Updating the squash command to reference origin/master instead of the local master branch in the event a local environment's master branch is not up to date.

changed the description

added 72 commits

• c62e703f...9b9e9577 - 53 commits from branch master
• b94b0f57 - chore: add common labels
• 32d12454 - fix: added remaining labels to gitlab repo
• 001812f6 - fix: bump version
• b6e72096 - ci: widen regex for skipping ci on docs branches
• 67fb0169 - chore: update proposed version
• 76f2d072 - chore: forgot changlog update
• 252cb321 - kiwi-sidecar
• 29d63756 - feat: Simplification of Grafana OIDC Configuration
• 232d3876 - feat: Grafana OIDC template and documentation
• 3c45a589 - feat: Grafana OIDC template and documentation
• 97d21784 - feat: Grafana OIDC template and documentation
• 91fb73c5 - feat: Grafana OIDC template and documentation
• 4c6a755d - Merge remote-tracking branch 'origin/add-kube-labels' into staging
• d2284171 - Merge remote-tracking branch 'origin/bb-843-grafana' into staging
• 74300c69 - Merge remote-tracking branch 'origin/ci/skip-docs' into staging
• 4f234091 - chore: updated changlog
• f9957122 - ci: only run infra jobs on merges to master
• 3388a9b3 - Merge branch 'ci/staging' into 'staging'
• 7c09176a - docs: update contributing guide to rebase of origin/master not local master branch

Compare with previous version

changed target branch from master to staging

approved this merge request

mentioned in commit 923f86bc

merged