MNT: (deps): Bump pandas from 3.0.3 to 3.0.4 in /ci

Bumps [pandas](https://github.com/pandas-dev/pandas) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Commits](pandas-dev/pandas@v3.0.3...v3.0.4)

---
updated-dependencies:
- dependency-name: pandas
  dependency-version: 3.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

ci/requirements.txt

@@ -1,6 +1,6 @@
 python>=3.7
 matplotlib==3.11.0
 numpy==2.5.0
-pandas==3.0.3
+pandas==3.0.4
 netcdf4==1.7.4
 erddapy==2026.6.12