fix indoc::formatdoc error

[JeremyMoeglich]

This PR fixes two compile errors, by passing values to indoc::formatdoc! explicitly

error: there is no argument named `err_str`
   --> psl/psl-core/src/configuration/datasource.rs:130:44
    |
130 |                   let s = indoc::formatdoc! {"
    |  ____________________________________________^
131 | |                     {err_str}
132 | |
133 | |                     To use a URL with protocol `prisma://` the Data Proxy must be enabled via `prisma generate --data-proxy`.
134 | |
135 | |                     More information about Data Proxy: https://pris.ly/d/data-proxy
136 | |                 "};
    | |_________________^
    |
    = note: did you intend to capture a variable `err_str` from the surrounding scope?
    = note: to avoid ambiguity, `format_args!` cannot capture variables when the format string is expanded from a macro

and

    error: there is no argument named `child_id`
   --> query-engine/connector-test-kit-rs/query-tests-setup/src/schema_gen/schema_with_relation.rs:167:64
    |
167 |   ...                   let datamodel = indoc::formatdoc! {"
    |  __________________________________________________________^
168 | | ...                       model Parent {{
169 | | ...                           p             String    @unique
170 | | ...                           p_1           String
...   |
188 | | ...                       }}
189 | | ...                   "};
    | |_______________________^
    |
    = note: did you intend to capture a variable `child_id` from the surrounding scope?
    = note: to avoid ambiguity, `format_args!` cannot capture variables when the format string is expanded from a macro
    ```

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[tomhoule]

Hi @JeremyMoeglich , thanks for the PR! These formatdoc!() calls are working as intended, they're just using the implicit format args feature, that has been stable for a while. So I don't think we need to make this change. The error should disappear if you upgrade your rust toolchain.

[JeremyMoeglich]

Hi @JeremyMoeglich , thanks for the PR! These formatdoc!() calls are working as intended, they're just using the implicit format args feature, that has been stable for a while. So I don't think we need to make this change. The error should disappear if you upgrade your rust toolchain.

The issue occurs on Nightly but not Stable. So the issue might appear in future stable versions.
Implicit format args are working fine in both versions
@tomhoule

[tomhoule]

Ah that's a different issue. It looks like it's a known problem, I don't know if it will make it to stable, and even then, if indoc doesn't fix it. I'd delay any action until then.