GHA: unify http3 workflows into one

This commit unifies the following http3 workflows into http3-linux.yml:

- ngtcp2-linux.yml
- osslq-linux.yml
- quiche-linux.yml

GHA: unify http3 workflows into one

This commit unifies the following http3 workflows into http3-linux.yml:

- ngtcp2-linux.yml
- osslq-linux.yml
- quiche-linux.yml

The idea is better use of the build cache. Previously, they
independently create caches with the same key. Some of the caches
include source code and intermediate object files, which makes cache
quite large. In this commit, only built artifacts are cached, which
drastically reduces the cache size. OpenSSL v3, mod_h2 and quiche caches
still include all stuff, but they are left for the later improvement.
Because the contents of the cache have been changed, the cache keys are
also changed to include the word "http3".

Closes #13841

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ci: disable Renovate dashboard

The Renovate dashboard insists on an open issue,
which is a problem. Disable the dashboard. Status
can still be seen at https://developer.mend.io/githu

ci: disable Renovate dashboard

The Renovate dashboard insists on an open issue,
which is a problem. Disable the dashboard. Status
can still be seen at https://developer.mend.io/github/curl/curl.

Fixes #13630
Closes #13673

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CI: renovate updates

- GHA: update actions/checkout action to v4
- GHA: update wolfSSL/wolfssh to v1.4.17
- GHA: update wolfSSL/wolfssl to v5.7.0
- Update the regex config in ren

CI: renovate updates

- GHA: update actions/checkout action to v4
- GHA: update wolfSSL/wolfssh to v1.4.17
- GHA: update wolfSSL/wolfssl to v5.7.0
- Update the regex config in renovate.json

Closes #13632
Closes #13641
Closes #13658
Closes #13659

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ci: set semantic type as CI and include digests as CI operations

Replace "chore" with "ci" for renovate's semantic
type, and include digests with "pin" and
"pinDigest" as ci operatio

ci: set semantic type as CI and include digests as CI operations

Replace "chore" with "ci" for renovate's semantic
type, and include digests with "pin" and
"pinDigest" as ci operations.

Closes #13644

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ci: reconfigure renovate

- set prefix for github actions updates to be gha:
- set prefix for other renovate actions to be ci:
- disable debian updates in linux-old.yml

Group all non-major updates together to reduce PR spam

Add some basic versioning for some workflows to check whether this is detected properly

Add renovate.json