fix(core): ensure ngx.ctx.host_port is a number (and not a string)

[bungle]

Summary

It turns out that ngx.ctx.host_port may be a string in some cases, which leads to bugs elsewhere where it may be expected to be a number. This adds tonumber call to ensure that it is a number.

This bug affects for example PDK function kong.request.get_forwarded_port().

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Issue reference

https://konghq.atlassian.net/browse/KAG-4158

[team-gateway-bot]

Backport failed for release/2.8.x, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release/2.8.x
git worktree add -d .worktree/backport-12806-to-release/2.8.x origin/release/2.8.x
cd .worktree/backport-12806-to-release/2.8.x
git switch --create backport-12806-to-release/2.8.x
git cherry-pick -x 72632106b61949de69ae4dd7b59deedea4ed7626

[team-gateway-bot]

Backport failed for release/3.3.x, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release/3.3.x
git worktree add -d .worktree/backport-12806-to-release/3.3.x origin/release/3.3.x
cd .worktree/backport-12806-to-release/3.3.x
git switch --create backport-12806-to-release/3.3.x
git cherry-pick -x 72632106b61949de69ae4dd7b59deedea4ed7626

[team-gateway-bot]

Backport failed for release/3.4.x, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release/3.4.x
git worktree add -d .worktree/backport-12806-to-release/3.4.x origin/release/3.4.x
cd .worktree/backport-12806-to-release/3.4.x
git switch --create backport-12806-to-release/3.4.x
git cherry-pick -x 72632106b61949de69ae4dd7b59deedea4ed7626

[team-gateway-bot]

Backport failed for release/3.5.x, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release/3.5.x
git worktree add -d .worktree/backport-12806-to-release/3.5.x origin/release/3.5.x
cd .worktree/backport-12806-to-release/3.5.x
git switch --create backport-12806-to-release/3.5.x
git cherry-pick -x 72632106b61949de69ae4dd7b59deedea4ed7626

[team-gateway-bot]

Successfully created cherry-pick PR for master:

• https://github.com/kong/kong-ee/pull/8775

[team-gateway-bot]

Backport failed for release/3.6.x, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin release/3.6.x
git worktree add -d .worktree/backport-12806-to-release/3.6.x origin/release/3.6.x
cd .worktree/backport-12806-to-release/3.6.x
git switch --create backport-12806-to-release/3.6.x
git cherry-pick -x 72632106b61949de69ae4dd7b59deedea4ed7626

[kikito]

We won't backport this further than 3.4