Fix/2026 03 19 grpc CVE

[raharper]

What type of PR is this?

bug

Which issue does this PR fix:

Dependabot Alert on gprc: CVE-2026-33186

GHSA-p77j-4mvh-x3m3

What does this PR do / Why do we need it:

Bump grpc to v1.79.3 which includes fix for CVE-2026-33186

If an issue # is not available please add repro steps and logs showing the issue:

1. $ git log --pretty=oneline -1
8e9e9d688687e737e68c888699fddb16da85e43a (HEAD -> main, origin/main, origin/HEAD) fix: Add warning for stacker files with bom: set
2. $ grype --version
grype 0.110.0
3. 

$ grype stacker
 ✔ Indexed file system                   stacker
 ✔ Cataloged contents                    57b8f1fe1e1d380b8c82ecb19ec6bcabcf4a24a6e8be79a14a8a1cf85b4f2dde
   ├── ✔ Packages                        [134 packages]
   ├── ✔ Executables                     [1 executables]
   ├── ✔ File digests                    [1 files]
   └── ✔ File metadata                   [1 locations]
 ✔ Scanned for vulnerabilities     [1 vulnerability matches]
   ├── by severity: 1 critical, 0 high, 0 medium, 0 low, 0 negligible
   └── by status:   1 fixed, 0 not-fixed, 0 ignored
NAME                    INSTALLED  FIXED IN  TYPE       VULNERABILITY        SEVERITY  EPSS  RISK
google.golang.org/grpc  v1.76.0    1.79.3    go-module  GHSA-p77j-4mvh-x3m3  Critical  N/A   N/A

Testing done on this change:

Automation added to e2e:

None

Will this break upgrades or downgrades?

No

Does this PR introduce any user-facing change?:

No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.22%. Comparing base (551b30d) to head (62576ca).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #759   +/-   ##
=======================================
  Coverage   54.22%   54.22%           
=======================================
  Files          55       55           
  Lines        5909     5909           
=======================================
  Hits         3204     3204           
  Misses       2126     2126           
  Partials      579      579           

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[hallyn]

Thanks, Ryan!

Should we just have github squash-merge, or were you going to rebase -i?

[raharper]

Thanks, Ryan!

Should we just have github squash-merge, or were you going to rebase -i?

#760

Let's merge this (just the fix) and I'll rebase this PR