Update actions/checkout in GitHub Actions to v3

[martinmoene]

See bit-lite PR 3.

Plan:

• lest (NA)
• active-lite
• any-lite
• atomic-lite
• bit-lite
• boolean-lite
• byte-lite
• expected-lite
• invoke-lite
• jthread-lite
• observer-ptr-lite
• optional-bare
• optional-lite
• optional-fun-lite
• ring-span-lite
• scope-lite
• span-lite
• status-value-lite
• string-lite (NA)
• string-view-lite
• type-lite
• value-ptr-lite
• variant-lite
• nonstd-lite-project

Other:

• rpc-lite

[striezel]

Just for information: Some of the projects mentioned in the plan above have no pull request, but for some the corresponding change was already made earlier:

• expected-lite: martinmoene/expected-lite@8c05f55 / update actions/checkout in GitHub Actions to v3 expected-lite#45
• span-lite: martinmoene/span-lite@dbb484f / update actions/checkout in GitHub Actions to v3 span-lite#75
• string-view-lite: martinmoene/string-view-lite@f7aca36 / update actions/checkout in GitHub Actions to v3 string-view-lite#51

[martinmoene]

@striezel Thanks again :)

[striezel]

@striezel Thanks again :)

You're welcome. After all, we C++ users have to support each other. :)

And as a nice side effect this is a new personal record for the number of pull requests per day. 😄