feat: SECOPS-2525 - add semgrep job (#438)

## Motivation / Implements

This PR adds or updates the necessary configuration to enable
[Semgrep](https://semgrep.dev/docs/semgrep-code/overview/) to run on PRs
on this repo. The Apollo Security team uses Semgrep to test our source
for potential security vulnerabilities.

Once this is accepted and merged, the Security team plans to make a
passing Semgrep check a requirement for PRs to merge into this repo.
This will prevent net-new severe issues from being introduced. The job
proposed by this PR runs in a diff-aware mode, so it will only alert if
net-new issues are introduced in a branch.

In the event that a severe issue _is_ detected on a PR, the CI job will
add a comment to the PR associated with the detection to provide
instructions on how to properly resolve the detection. The comment added
to PRs will also include instructions on how to get further support if
needed.

If maintainers reviewing this PR have questions, please reach out in the
`#security` channel in Slack or contact Matt Peake directly at
`matt[.]peake@apollographql[.]com`.

## Changed

- Updated `.circleci/config.yml` to include appropriate configuration to
enable Semgrep as a CI check. These changes were programmatically
generated, so YAML formatting may have been modified to conform to the
YAML spec.
- Updated SecOps orb to latest version

---------

Co-authored-by: Matt Peake <[email protected]>
Co-authored-by: Iryna Shestak <[email protected]>

.circleci/config.yml

@@ -4,7 +4,7 @@ version: 2.1
 orbs:
   rust: circleci/[email protected]
   gh: circleci/[email protected]
-  secops: apollo/[email protected].1
+  secops: apollo/[email protected].6
 
 # These filters are used to determine which package to release
 any_release: &any_release
@@ -105,7 +105,7 @@ workflows:
             - "Run cargo tests (stable rust on amd_macos)"
             - "Run cargo tests (stable rust on amd_windows)"
           <<: *crate_release
-  
+
   security-scans:
     jobs:
       - secops/gitleaks:
@@ -116,6 +116,11 @@ workflows:
           git-base-revision: <<#pipeline.git.base_revision>><<pipeline.git.base_revision>><</pipeline.git.base_revision >>
           git-revision: << pipeline.git.revision >>
 
+      - secops/semgrep:
+          context:
+            - secops-oidc
+            - github-orb
+          git-base-revision: <<#pipeline.git.base_revision>><<pipeline.git.base_revision>><</pipeline.git.base_revision >>
 jobs:
   xtask:
     parameters:
@@ -461,4 +466,4 @@ commands:
                   If you would like to verify that the binary you have downloaded was built from the source code in this repository, you can compute a checksum of the zipped tarball and compare it to the checksums that are included as release artifacts.
 
                   Binaries built for MacOS are signed, notarized, and automatically verified with [Gatekeeper](https://support.apple.com/guide/deployment-reference-macos/using-gatekeeper-apd02b925e38/web).' \
-                  artifacts/*
+                  artifacts/*