CLN: replace %s syntax with .format in tests.io.formats/json/sas
- [x]  Progress towards #16130
- [x]  tests passed
- [x]  passes git diff upstream/master -u -- "*.py" | flake8 --diff
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=h1) Report
> Merging [#18351](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/cfad581e9a6d35c7d05d2b1f34e4a19f7ee15cc6?src=pr&el=desc) will **decrease** coverage by `0.04%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18351/graphs/tree.svg?height=150&width=650&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #18351      +/-   ##
==========================================
- Coverage   91.38%   91.34%   -0.05%     
==========================================
  Files         164      164              
  Lines       49790    49790              
==========================================
- Hits        45501    45480      -21     
- Misses       4289     4310      +21
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.14% <ø> (-0.03%)` | :arrow_down: |
| #single | `39.49% <ø> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `63.44% <0%> (-1.82%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.8% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=footer). Last update [cfad581...57b7263](https://codecov.io/gh/pandas-dev/pandas/pull/18351?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!