calc_light_merged throws deprecated error

### Brief problem description

I am trying to use the `calc_light_merged` function to model PAR based on observed PAR and the smoothed PAR produced with `calc_light`. However, the `calc_light_merged` function produces an error caused by a function that is deprecated in `dplyr` (`rename_vars`). Is there a work around for this issue?

``` r
# 1. Load libraries ----
library(tidyverse)
library(nasapower)
library(streamMetabolizer)

# 2. Download shortwave radiation from NASA POWER ----
nasa_par <- get_power(
community = 'ag',
pars = c('ALLSKY_SFC_PAR_TOT'), # All Sky Surface PAR Total (W/m^2)
temporal_api = 'hourly',
lonlat = c(-78.6, 38.7),
dates = '2010-09-19')

# 3. Some data wrangling to create the 2-column data frame needed for calc_light_merged ----
nasa_par_df <- nasa_par %>%
mutate(dateTime = make_datetime(year = YEAR,
month = MO,
day = DY,
hour = HR),
solar.time = calc_solar_time(dateTime, -78.6), # throws a warning but still works
light = convert_SW_to_PAR(ALLSKY_SFC_PAR_TOT)) %>%
select(solar.time, light) %>%
data.frame()
#> Warning: There was 1 warning in `mutate()`.
#> ℹ In argument: `solar.time = calc_solar_time(dateTime, -78.6)`.
#> Caused by warning in `lookup_timezone()`:
#> ! Google timezone lookup now requires an API key; see http://g.co/dev/maps-no-account or provide the timezone

max_PAR_value <- max(nasa_par_df$light, na.rm = TRUE)

# 4. Apply calc_light_merged ----
light_mod <- nasa_par_df %>%
mutate(light = calc_light_merged(PAR.obs = nasa_par_df,
solar.time = solar.time,
latitude = 38.7,
longitude = -78.6,
max.PAR = max_PAR_value))
#> Error in `mutate()`:
#> ℹ In argument: `light = calc_light_merged(...)`.
#> Caused by error:
#> ! error in evaluating the argument 'object' in selecting a method for function 'deunitted': `rename_vars()` was deprecated in dplyr 0.8.4 and is now defunct.
#> ℹ Please use `tidyselect::vars_rename()` instead.
```

^{Created on 2024-10-22 with [reprex v2.1.1](https://reprex.tidyverse.org)}

``` r
devtools::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#> setting value
#> version R version 4.4.1 (2024-06-14 ucrt)
#> os Windows 11 x64 (build 22631)
#> system x86_64, mingw32
#> ui RTerm
#> language (EN)
#> collate English_United States.utf8
#> ctype English_United States.utf8
#> tz America/New_York
#> date 2024-10-22
#> pandoc 3.2 @ C:/Program Files/RStudio/resources/app/bin/quarto/bin/tools/ (via rmarkdown)
#>
#> ─ Packages ───────────────────────────────────────────────────────────────────
#> package * version date (UTC) lib source
#> cachem 1.1.0 2024-05-16 [1] CRAN (R 4.4.1)
#> cli 3.6.3 2024-06-21 [1] CRAN (R 4.4.1)
#> devtools 2.4.5 2022-10-11 [1] CRAN (R 4.4.1)
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#> htmlwidgets 1.6.4 2023-12-06 [1] CRAN (R 4.4.1)
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#> pkgbuild 1.4.4 2024-03-17 [1] CRAN (R 4.4.1)
#> pkgload 1.4.0 2024-06-28 [1] CRAN (R 4.4.1)
#> profvis 0.3.8 2023-05-02 [1] CRAN (R 4.4.1)
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#> purrr 1.0.2 2023-08-10 [1] CRAN (R 4.4.1)
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#> reprex 2.1.1 2024-07-06 [1] CRAN (R 4.4.1)
#> rlang 1.1.4 2024-06-04 [1] CRAN (R 4.4.1)
#> rmarkdown 2.27 2024-05-17 [1] CRAN (R 4.4.1)
#> rstudioapi 0.16.0 2024-03-24 [1] CRAN (R 4.4.1)
#> sessioninfo 1.2.2 2021-12-06 [1] CRAN (R 4.4.1)
#> shiny 1.8.1.1 2024-04-02 [1] CRAN (R 4.4.1)
#> stringi 1.8.4 2024-05-06 [1] CRAN (R 4.4.0)
#> stringr 1.5.1 2023-11-14 [1] CRAN (R 4.4.1)
#> urlchecker 1.0.1 2021-11-30 [1] CRAN (R 4.4.1)
#> usethis 2.2.3 2024-02-19 [1] CRAN (R 4.4.1)
#> vctrs 0.6.5 2023-12-01 [1] CRAN (R 4.4.1)
#> withr 3.0.0 2024-01-16 [1] CRAN (R 4.4.1)
#> xfun 0.45 2024-06-16 [1] CRAN (R 4.4.1)
#> xtable 1.8-4 2019-04-21 [1] CRAN (R 4.4.1)
#> yaml 2.3.9 2024-07-05 [1] CRAN (R 4.4.1)
#>
#> [1] C:/Users/stassone/AppData/Local/Programs/R/R-4.4.1/library
#>
#> ──────────────────────────────────────────────────────────────────────────────
```

^{Created on 2024-10-22 with [reprex v2.1.1](https://reprex.tidyverse.org)}

Start by tracing the calc_light_merged entry point and the reported rename_vars call, then compare how calc_light handles the same inputs. The payload names no source or test files, so locate the function and any existing light-calculation tests first. Done means calc_light_merged runs with the supplied PAR data without the deprecated-function error and preserves its expected output.

Written by the indexing model from the issue text.