chore(ci): pin circleCI images

[Yun-Kim]

This PR pins the docker images used in our CircleCI tests. This is in preparation for the 2.0 release and freezing docker images and test dependencies for the 1.x release line to ease maintenance of the 1.x branch.

Checklist

• Change(s) are motivated and described in the PR description.
• Testing strategy is described if automated tests are not included in the PR.
• Risk is outlined (performance impact, potential for breakage, maintainability, etc).
• Change is maintainable (easy to change, telemetry, documentation).
• Library release note guidelines are followed. If no release note is required, add label changelog/no-changelog.
• Documentation is included (in-code, generated user docs, public corp docs).
• Backport labels are set (if applicable)

Reviewer Checklist

• Title is accurate.
• No unnecessary changes are introduced.
• Description motivates each change.
• Avoids breaking API changes unless absolutely necessary.
• Testing strategy adequately addresses listed risk(s).
• Change is maintainable (easy to change, telemetry, documentation).
• Release note makes sense to a user of the library.
• Reviewer has explicitly acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment.
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-08-14 13:42:10

Comparing candidate commit c27d4b9 in PR branch yunkim/pin-docker-images with baseline commit 1b5f01a in branch 1.x.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 94 metrics, 0 unstable metrics.